Exhibit 2.3

ACASTI PHARMA INC.

as
the Corporation

and

COMPUTERSHARE TRUST COMPANY OF CANADA

as the Warrant Agent





WARRANT INDENTURE

Providing for the Issue of Warrants

Dated as of February 21, 2017







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TABLE OF CONTENTS



|                               |  |                                                                |    |  |    | 
|------------------------------ |  | -------------------------------------------------------------- | -- |  | -- | 
|ARTICLE 1 INTERPRETATION       |  |                                                                | 2  | 
|                               |  |                                                               
|1.1                            |  | Definitions.                                                   |    |  | 2  | 
|                               |  |                                                               
|1.2                            |  | Gender and Number.                                             |    |  | 6  | 
|                               |  |                                                               
|1.3                            |  | Headings, Etc.                                                 |    |  | 6  | 
|                               |  |                                                               
|1.4                            |  | Day not a Business Day.                                        |    |  | 6  | 
|                               |  |                                                               
|1.5                            |  | Time of the Essence.                                           |    |  | 6  | 
|                               |  |                                                               
|1.6                            |  | Monetary References.                                           |    |  | 6  | 
|                               |  |                                                               
|1.7                            |  | Applicable Law.                                                |    |  | 6  | 
|                               | 
|ARTICLE 2 ISSUE OF WARRANTS    |  |                                                                | 7  | 
|                               |  |                                                               
|2.1                            |  | Creation and Issue of Warrants.                                |    |  | 7  | 
|                               |  |                                                               
|2.2                            |  | Terms of Warrants.                                             |    |  | 7  | 
|                               |  |                                                               
|2.3                            |  | Warrantholder not a Shareholder.                               |    |  | 7  | 
|                               |  |                                                               
|2.4                            |  | Warrants to Rank Pari Passu.                                   |    |  | 8  | 
|                               |  |                                                               
|2.5                            |  | Form of Warrants and Certificated Warrants.                    |    |  | 8  | 
|                               |  |                                                               
|2.6                            |  | Beneficial Holders of Warrants.                                |    |  | 8  | 
|                               |  |                                                               
|2.7                            |  | Warrant Certificate.                                           |    |  | 10 | 
|                               |  |                                                               
|2.8                            |  | Legends.                                                       |    |  | 11 | 
|                               |  |                                                               
|2.9                            |  | Register of Warrants                                           |    |  | 13 | 
|                               |  |                                                               
|2.10                           |  | Issue in Substitution for Warrant Certificates Lost, etc.      |    |  | 14 | 
|                               |  |                                                               
|2.11                           |  | Exchange of Warrant Certificates.                              |    |  | 15 | 
|                               |  |                                                               
|2.12                           |  | Transfer and Ownership of Warrants.                            |    |  | 15 | 
|                               |  |                                                               
|2.13                           |  | Cancellation of Surrendered Warrants.                          |    |  | 16 | 
|                               | 
|ARTICLE 3 EXERCISE OF WARRANTS |  |                                                                | 16 | 
|                               |  |                                                               
|3.1                            |  | Right of Exercise.                                             |    |  | 16 | 
|                               |  |                                                               
|3.2                            |  | Warrant Exercise.                                              |    |  | 17 | 
|                               |  |                                                               
|3.3                            |  | Securities Restrictions.                                       |    |  | 19 | 
|                               |  |                                                               
|3.4                            |  | Prohibition on Exercise by U.S. Persons; Legended Certificates |    |  | 20 | 
|                               |  |                                                               
|3.5                            |  | Transfer Fees and Taxes.                                       |    |  | 21 | 
|                               |  |                                                               
|3.6                            |  | Warrant Agency.                                                |    |  | 21 | 
|                               |  |                                                               
|3.7                            |  | Effect of Exercise of Warrant Certificates.                    |    |  | 22 | 
|                               |  |                                                               
|3.8                            |  | Partial Exercise of Warrants; Fractions.                       |    |  | 22 | 



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- 2 -



|                                                                   |  |                                                           |    |  |    | 
|------------------------------------------------------------------ |  | --------------------------------------------------------- | -- |  | -- | 
|                                                                   |  |                                                          
|3.9                                                                |  | Expiration of Warrants.                                   |    |  | 23 | 
|                                                                   |  |                                                          
|3.10                                                               |  | Accounting and Recording.                                 |    |  | 23 | 
|                                                                   | 
|ARTICLE 4 ADJUSTMENT OF NUMBER OF COMMON SHARES AND EXERCISE
PRICE |  |                                                           | 23 | 
|                                                                   |  |                                                          
|4.1                                                                |  | Adjustment of Number of Common Shares and Exercise Price. |    |  | 23 | 
|                                                                   |  |                                                          
|4.2                                                                |  | Entitlement to Common Shares on Exercise of Warrant.      |    |  | 27 | 
|                                                                   |  |                                                          
|4.3                                                                |  | No Adjustment for Certain Transactions.                   |    |  | 27 | 
|                                                                   |  |                                                          
|4.4                                                                |  | Determination by Independent Firm.                        |    |  | 28 | 
|                                                                   |  |                                                          
|4.5                                                                |  | Proceedings Prior to any Action Requiring Adjustment.     |    |  | 28 | 
|                                                                   |  |                                                          
|4.6                                                                |  | Certificate of Adjustment.                                |    |  | 28 | 
|                                                                   |  |                                                          
|4.7                                                                |  | Notice of Special Matters.                                |    |  | 28 | 
|                                                                   |  |                                                          
|4.8                                                                |  | No Action after Notice.                                   |    |  | 28 | 
|                                                                   |  |                                                          
|4.9                                                                |  | Other Action.                                             |    |  | 29 | 
|                                                                   |  |                                                          
|4.10                                                               |  | Protection of Warrant Agent.                              |    |  | 29 | 
|                                                                   |  |                                                          
|4.11                                                               |  | Participation by Warrantholder.                           |    |  | 29 | 
|                                                                   | 
|ARTICLE 5 RIGHTS OF THE CORPORATION AND COVENANTS                  |  |                                                           | 30 | 
|                                                                   |  |                                                          
|5.1                                                                |  | Optional Purchases by the Corporation.                    |    |  | 30 | 
|                                                                   |  |                                                          
|5.2                                                                |  | General Covenants.                                        |    |  | 30 | 
|                                                                   |  |                                                          
|5.3                                                                |  | Warrant Agents Remuneration and Expenses.                |    |  | 31 | 
|                                                                   |  |                                                          
|5.4                                                                |  | Performance of Covenants by Warrant Agent.                |    |  | 31 | 
|                                                                   |  |                                                          
|5.5                                                                |  | Enforceability of Warrants.                               |    |  | 31 | 
|                                                                   | 
|ARTICLE 6 ENFORCEMENT                                              |  |                                                           | 32 | 
|                                                                   |  |                                                          
|6.1                                                                |  | Suits by Registered Warrantholders.                       |    |  | 32 | 
|                                                                   |  |                                                          
|6.2                                                                |  | Suits by the Corporation.                                 |    |  | 32 | 
|                                                                   |  |                                                          
|6.3                                                                |  | Immunity of Shareholders, etc.                            |    |  | 32 | 
|                                                                   |  |                                                          
|6.4                                                                |  | Waiver of Default.                                        |    |  | 32 | 
|                                                                   | 
|ARTICLE 7 MEETINGS OF REGISTERED WARRANTHOLDERS                    |  |                                                           | 33 | 
|                                                                   |  |                                                          
|7.1                                                                |  | Right to Convene Meetings.                                |    |  | 33 | 
|                                                                   |  |                                                          
|7.2                                                                |  | Notice.                                                   |    |  | 33 | 
|                                                                   |  |                                                          
|7.3                                                                |  | Chairman.                                                 |    |  | 33 | 
|                                                                   |  |                                                          
|7.4                                                                |  | Quorum.                                                   |    |  | 33 | 
|                                                                   |  |                                                          
|7.5                                                                |  | Power to Adjourn.                                         |    |  | 34 | 
|                                                                   |  |                                                          
|7.6                                                                |  | Show of Hands.                                            |    |  | 34 | 



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|                                       |  |                                                             |    |  |    | 
|-------------------------------------- |  | ----------------------------------------------------------- | -- |  | -- | 
|                                       |  |                                                            
|7.7                                    |  | Poll and Voting.                                            |    |  | 34 | 
|                                       |  |                                                            
|7.8                                    |  | Regulations.                                                |    |  | 34 | 
|                                       |  |                                                            
|7.9                                    |  | Corporation and Warrant Agent May be Represented.           |    |  | 35 | 
|                                       |  |                                                            
|7.10                                   |  | Powers Exercisable by Extraordinary Resolution.             |    |  | 35 | 
|                                       |  |                                                            
|7.11                                   |  | Meaning of Extraordinary Resolution.                        |    |  | 36 | 
|                                       |  |                                                            
|7.12                                   |  | Powers Cumulative.                                          |    |  | 37 | 
|                                       |  |                                                            
|7.13                                   |  | Minutes.                                                    |    |  | 37 | 
|                                       |  |                                                            
|7.14                                   |  | Instruments in Writing.                                     |    |  | 37 | 
|                                       |  |                                                            
|7.15                                   |  | Binding Effect of Resolutions.                              |    |  | 37 | 
|                                       |  |                                                            
|7.16                                   |  | Holdings by Corporation Disregarded.                        |    |  | 37 | 
|                                       | 
|ARTICLE 8 SUPPLEMENTAL INDENTURES      |  |                                                             | 38 | 
|                                       |  |                                                            
|8.1                                    |  | Provision for Supplemental Indentures for Certain Purposes. |    |  | 38 | 
|                                       |  |                                                            
|8.2                                    |  | Successor Entities.                                         |    |  | 39 | 
|                                       | 
|ARTICLE 9 CONCERNING THE WARRANT AGENT |  |                                                             | 39 | 
|                                       |  |                                                            
|9.1                                    |  | Trust Indenture Legislation.                                |    |  | 39 | 
|                                       |  |                                                            
|9.2                                    |  | Rights and Duties of Warrant Agent.                         |    |  | 39 | 
|                                       |  |                                                            
|9.3                                    |  | Evidence, Experts and Advisers.                             |    |  | 40 | 
|                                       |  |                                                            
|9.4                                    |  | Documents, Monies, etc. Held by Warrant Agent.              |    |  | 41 | 
|                                       |  |                                                            
|9.5                                    |  | Actions by Warrant Agent to Protect Interest.               |    |  | 41 | 
|                                       |  |                                                            
|9.6                                    |  | Warrant Agent Not Required to Give Security.                |    |  | 41 | 
|                                       |  |                                                            
|9.7                                    |  | Protection of Warrant Agent.                                |    |  | 42 | 
|                                       |  |                                                            
|9.8                                    |  | Replacement of Warrant Agent; Successor by Merger.          |    |  | 43 | 
|                                       |  |                                                            
|9.9                                    |  | Conflict of Interest.                                       |    |  | 43 | 
|                                       |  |                                                            
|9.10                                   |  | Acceptance of Agency.                                       |    |  | 44 | 
|                                       |  |                                                            
|9.11                                   |  | Warrant Agent Not to be Appointed Receiver.                 |    |  | 44 | 
|                                       |  |                                                            
|9.12                                   |  | Warrant Agent Not Required to Give Notice of Default.       |    |  | 44 | 
|                                       |  |                                                            
|9.13                                   |  | Anti-Money Laundering.                                      |    |  | 44 | 
|                                       |  |                                                            
|9.14                                   |  | Compliance with Privacy Code.                               |    |  | 45 | 
|                                       |  |                                                            
|9.15                                   |  | Securities Exchange Commission Certification.               |    |  | 45 | 
|                                       | 
|ARTICLE 10 GENERAL                     |  |                                                             | 46 | 
|                                       |  |                                                            
|10.1                                   |  | Notice to the Corporation and the Warrant Agent.            |    |  | 46 | 
|                                       |  |                                                            
|10.2                                   |  | Notice to Registered Warrantholders.                        |    |  | 46 | 
|                                       |  |                                                            
|10.3                                   |  | Ownership of Warrants.                                      |    |  | 47 | 



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|      |  |                                                                                                      |  |  |    | 
|----- |  | ---------------------------------------------------------------------------------------------------- |  |  | -- | 
|      |  |                                                                                                     
|10.4  |  | Counterparts.                                                                                        |  |  | 47 | 
|      |  |                                                                                                     
|10.5  |  | Satisfaction and Discharge of Indenture.                                                             |  |  | 47 | 
|      |  |                                                                                                     
|10.6  |  | Provisions of Indenture and Warrants for the Sole Benefit of Parties and Registered Warrantholders.  |  |  | 48 | 
|      |  |                                                                                                     
|10.7  |  | Common Shares or Warrants Owned by the Corporation or its Subsidiaries  Certificate to be Provided. |  |  | 48 | 
|      |  |                                                                                                     
|10.8  |  | Severability.                                                                                        |  |  | 48 | 
|      |  |                                                                                                     
|10.9  |  | Force Majeure.                                                                                       |  |  | 49 | 
|      |  |                                                                                                     
|10.10 |  | Assignment, Successors and Assigns.                                                                  |  |  | 49 | 
|      |  |                                                                                                     
|10.11 |  | Rights of Rescission and Withdrawal for Holders.                                                     |  |  | 49 | 
|      |  |                                                                                                     
|10.12 |  | Language                                                                                             |  |  | 49 | 

SCHEDULES

|                                                                           
|---------------------------------------------------------------------------
|SCHEDULE A FORM OF WARRANT CERTIFICATE                                   
|                                                                           
|SCHEDULE B FORM OF TRANSFER CERTIFICATE                                  
|                                                                           
|SCHEDULE C EXERCISE FORM                                                 
|                                                                           
|SCHEDULE D FORM OF DECLARATION FOR REMOVAL OF LEGEND                     
|                                                                           
|SCHEDULE E FORM OF U.S. PURCHASER CERTIFICATION UPON EXERCISE OF WARRANTS



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WARRANT INDENTURE

THIS WARRANT INDENTURE is dated as of February 21, 2017.

BETWEEN:

ACASTI
PHARMA INC., a corporation incorporated under the laws of the Province of Québec (the Corporation),

- and -

COMPUTERSHARE TRUST COMPANY OF CANADA, a trust company existing under the laws of Canada and authorized to carry on
business in all provinces of Canada (the Warrant Agent),

WHEREAS in connection with its short form prospectus
dated February 10, 2017 filed with the Canadian provincial securities regulatory authorities in the provinces of Alberta, British Columbia, Manitoba, Ontario and Québec relating to a Canadian public offering and a concurrent offering by
way of private placements outside of Canada, including in the United States in an offering to accredited investors exempt from the registration requirements of the U.S. Securities Act (as defined herein), pursuant to Rule 501(a) of Regulation D
thereunder, the Corporation proposes to issue and sell 3,930,518 units (Units) of the Corporation (the Offering), each Unit comprising one (1) Common Share (as defined herein) and one half of one
(1/2) Warrant (as defined herein);

AND WHEREAS for the purpose of the Offering, the Corporation is proposing to issue
1,965,259 Warrants pursuant to this Indenture;

AND WHEREAS each whole Warrant shall, subject to adjustment, entitle the holder
thereof to acquire one (1) Common Share upon payment of the Exercise Price (as defined below) upon the terms and conditions herein set forth;

AND WHEREAS all acts and deeds necessary have been done and performed to make the Warrants, when created and issued as provided in this
Indenture, legal, valid and binding upon the Corporation with the benefits and subject to the terms of this Indenture;

AND WHEREAS
the foregoing recitals are made as representations and statements of fact by the Corporation and not by the Warrant Agent;

NOW
THEREFORE, in consideration of the premises and mutual covenants hereinafter contained and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the Corporation hereby appoints the Warrant Agent as
warrant agent to hold the rights, interests and benefits contained herein for and on behalf of those persons who from time to time become the holders of Warrants issued pursuant to this Indenture and the parties hereto agree as follows:



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ARTICLE 1

INTERPRETATION



|1.1 | Definitions.
|--- | ------------

In this Indenture, including the recitals and schedules hereto, and in all indentures supplemental hereto:

Acceleration Notice means the notice of acceleration deliverable to the Warrantholders upon the Corporations exercise
of the Acceleration Rights;

Acceleration Right means the right of the Corporation to accelerate the Expiry Date to a
date that is not the less than 30 days following delivery of the Acceleration Notice if, at any time at least four months after the Effective Date, the volume weighted average trading price of the Common Shares equals or exceeds CAD$2.65 for a
period of 20 consecutive trading dates on the TSXV;

Adjustment Period means the period from the Effective Date up to
and including the Expiry Time;

Applicable Legislation means any statute of Canada or a province thereof, and the
regulations under any such named or other statute, relating to warrant indentures or to the rights, duties and obligations of warrant agents under warrant indentures, to the extent that such provisions are at the time in force and applicable to this
Indenture;

Applicable Securities Laws means the applicable securities laws, regulations, rules, rulings and orders,
including the applicable federal and state securities laws and regulations of the United States, including the U.S. Securities Act, together with all related rules, policies, notices, blanket rulings, orders and all other regulatory instruments of
the securities regulators in the Provinces of Quebec, Ontario, Manitoba, Alberta and British Columbia, and the policies of the TSXV;

Auditors means a firm of chartered accountants duly appointed as auditors of the Corporation;

Authenticated means (a) with respect to the issuance of a Warrant Certificate, one which has been duly signed by the
Corporation and authenticated by manual signature of an authorized officer of the Warrant Agent, (b) with respect to the issuance of an Uncertificated Warrant, one in respect of which the Warrant Agent has completed all Internal Procedures such
that the particulars of such Uncertificated Warrant as required by Section 2.7 are entered in the register of holders of Warrants, Authenticate, Authenticating and Authentication have the
appropriate correlative meanings;

Book Based Participants means institutions that participate directly or indirectly
in the Book Based System;

Book Based System means the book-based securities registration and transfer system
administered by the Depository in accordance with its operating rules and procedures in force from time to time;

Book Based
Warrants means Warrants that are to be held by or on behalf of the Depository;



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Business Day means any day other than Saturday, Sunday or a statutory or civic
holiday, or any other day on which the banks or Warrant Agency are not open for business in Montreal, Québec or Toronto, Ontario and shall be a day on which the TSXV is open for trading;

CDS Global Warrants means Warrants representing all or a portion of the aggregate number of Warrants issued in the name of
the Depository represented by an Uncertificated Warrant, or if requested by the Depository or the Corporation, by a Warrant Certificate;

Certificated Warrant means a Warrant evidenced by a writing or writings substantially in the form of Schedule
A, attached hereto;

Common Shares means, subject to Article 4, fully paid and non-assessable
Class A shares of the Corporation as presently constituted;

Counsel means a barrister or solicitor and/or a firm
of barristers and/or solicitors retained by the Warrant Agent or retained by the Corporation and acceptable to the Warrant Agent, which may or may not be counsel for the Corporation;

Current Market Price of the Common Shares at any date means the weighted average of the trading price per Common Share for
each day there was a closing price for the twenty consecutive Trading Days ending on (and including) the third Trading Day immediately prior to such date on the TSXV, or if on such date the Common Shares are not listed on the TSXV, on such other
stock exchange upon which such Common Shares are listed as the directors of the Corporation may select for this purpose, or, if such Common Shares are not then listed on any stock exchange, on any over-the-counter market on which the Common Shares
are traded as the directors of the Corporation may select for this purpose, or if Common Shares are not then traded on any over-the-counter-market, then the Current Market Price shall be determined by the directors of the Corporation, acting
reasonably;

Depository means CDS Clearing and Depository Services Inc. or such other Person as is designated in
writing by the Corporation to act as depository in respect of the Warrants;

Dividends means any dividends paid by the
Corporation;

Effective Date means the date of this Indenture;

Exchange Rate means the number of Common Shares subject to the right of purchase under each Warrant;

Exercise Date means, in relation to the Warrants, the Business Day on which such Warrant is validly exercised or deemed to
be validly exercised in accordance with Article 3 hereof;

Exercise Notice has the meaning set forth in
Section 3.2(a);

Exercise Price at any time means the price at which a whole Common Share may be purchased by the
exercise of a whole Warrant, which is initially CAD$2.15 per Common Share, payable in immediately available Canadian funds, subject to adjustment in accordance with the provisions of Article 4;



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- 4 -



Expiry Date means the earlier of (i) February 21, 2022; and
(ii) thirty (30) days following the date of delivery of an Acceleration Notice;

Expiry Time means 5:00 p.m.
(Montreal time) on the Expiry Date;

Extraordinary Resolution has the meaning set forth in 7.11;

Issue Date means February 21, 2017;

Internal Procedures means in respect of the making of any one or more entries to, changes in or deletions of any one or
more entries in the register at any time (including without limitation, original issuance or registration of transfer of ownership) the minimum number of the Warrant Agents internal procedures customary at such time for the entry, change or
deletion made to be complete under the operating procedures followed at the time by the Warrant Agent, it being understood that neither preparation and issuance shall constitute part of such procedures for any purpose of this definition;

NASDAQ means The Nasdaq Stock Market;

person means an individual, body corporate, partnership, trust, warrant agent, executor, administrator, legal
representative or any unincorporated organization;

register means the one set of records and accounts maintained by
the Warrant Agent pursuant to Section 2.9;

Registered Warrantholders means the persons who are registered owners
of Warrants as such names appear on the register, and for greater certainty, shall include the Depository as well as the holders of Uncertificated Warrants appearing on the register of the Warrant Agent;

Regulation D means Regulation D as promulgated by the SEC under the U.S. Securities Act;

Regulation S means Regulation S as promulgated by the SEC under the U.S. Securities Act;

SEC means the United States Securities and Exchange Commission;

Shareholders means the holders of Common Shares;

Tax Act means theIncome Tax Act(Canada) and the regulations thereunder;

this Warrant Indenture, this Indenture, this Agreement, hereto
herein, hereby, hereof and similar expressions mean and refer to this indenture and any indenture, deed or instrument supplemental hereto; and the expressions Article,
Section, subsection and paragraph followed by a number, letter or both mean and refer to the specified article, section, subsection or paragraph of this indenture;

Trading Day means, with respect to the TSXV, a day on which such exchange is open for the transaction of business, and with
respect to another exchange or an over-the-counter market, means a day on which such exchange is open for the transaction of business;



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- 5 -



Transaction Instruction means a written order signed by the holder or the
Depository, entitled to request that one or more actions be taken, or such other form as may be reasonably acceptable to the Warrant Agent, requesting one or more such actions to be taken in respect of an Uncertificated Warrant;

TSXV means the TSX Venture Exchange;

Uncertificated Warrant means any Warrant which is not a Certificated Warrant, including uncertificated Warrants issued
through the Book-Based System;

United States means the United States of America, its territories and possessions, any
state of the United States, and the District of Columbia;

U.S. Accredited Investor Certificate means the U.S.
Accredited Investor Status Certificate attached as Schedule A to the subscription agreement relating to the U.S. Placement;

U.S.
Person has the meaning given to such term in Regulation S under the U.S. Securities Act;

U.S. Placement
means the original private placement in the United States of the Warrants on the date hereof;

U.S. Purchaser Letter
means the U.S. Purchaser letter in substantially the form attached hereto as Schedule E;

U.S. Securities
Act means the United States Securities Act of 1933, as amended;

U.S. Warrantholder means any
Warrantholder that is a U.S. Person, acquired Warrants in the United States or for the account or benefit of any U.S. Person or Person in the United States;

U.S. Warrant Legend means the U.S. restrictive legends set forth in Section 2.8(a);

Warrants means the Common Share purchase warrants created by and authorized by and issuable under this Indenture, to be
issued and countersigned hereunder in certificated form and/or held through the Book Based System on a no certificate issued basis, entitling the holder thereof to purchase one Common Share (subject to adjustment as herein provided) at the Exercise
Price prior to the Expiry Time or means the warrants issued and Authenticated hereunder, whether by way of Warrant Certificate or Uncertificated Warrant;

Warrant Agency means the principal office of the Warrant Agent in the City of Montreal, Québec, the City of Toronto,
Ontario, or such other place as may be designated in accordance with Section 3.6;

Warrant Agent means
Computershare Trust Company of Canada, in its capacity as warrant agent of the Warrants, or its successors from time to time;

Warrant Certificate means a certificate, substantially in the form set forth in Schedule A hereto, to evidence
those Warrants that will be evidenced by a certificate;

Warrantholders, or holders without
reference to Warrants, means the holders of Warrants and includes Registered Warrantholders and owners of Warrants who beneficially hold securities



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- 6 -



entitlements in respect of the Warrants through a Book Based Participant, and
Warrantholder means any of the Warrantholders;

Warrantholders Request means an instrument
signed in one or more counterparts by Registered Warrantholders entitled to acquire in the aggregate not less than 50% of the aggregate number of Common Shares which could be acquired pursuant to all Warrants then unexercised and outstanding,
requesting the Warrant Agent to take some action or proceeding specified therein; and

written order of the
Corporation, written request of the Corporation, written consent of the Corporation and certificate of the Corporation mean, respectively, a written order, request, consent and
certificate signed in the name of the Corporation by any duly authorized signatory of the Corporation and may consist of one or more instruments so executed.



|1.2 | Gender and Number.
|--- | ------------------

Words importing the singular number or masculine gender shall include the plural number or the feminine or neuter genders, and
vice versa.



|1.3 | Headings, Etc.
|--- | --------------

The division of this Indenture into Articles and Sections, the provision of a Table of Contents and the insertion of headings
are for convenience of reference only and shall not affect the construction or interpretation of this Indenture or of the Warrants.



|1.4 | Day not a Business Day.
|--- | -----------------------

If any day on or before which any action or notice is required to be taken or given hereunder is not a Business Day, then such
action or notice shall be required to be taken or given on or before the requisite time on the next succeeding day that is a Business Day.



|1.5 | Time of the Essence.
|--- | --------------------

Time shall be of the essence of this Indenture.



|1.6 | Monetary References.
|--- | --------------------

Whenever any amounts of money are referred to herein, such amounts shall be deemed to be in lawful money of Canada unless
otherwise expressed. References to CAD$ are references to Canadian dollars.



|1.7 | Applicable Law.
|--- | ---------------

This Indenture, the Warrants, the Warrant Certificates (including all documents relating thereto, which by common accord have
been and will be drafted in English) shall be construed in accordance with the laws of the Province of Québec and the federal laws of Canada applicable therein and shall be treated in all respects as legally-binding contracts. Each of the
parties hereto, which shall include the Warrantholders, irrevocably attorns to the exclusive jurisdiction of the courts of the Province of Québec with respect to all matters arising out of this Indenture and the transactions contemplated
herein.



---



- 7 -



ARTICLE 2

ISSUE OF WARRANTS



|2.1 | Creation and Issue of Warrants.
|--- | -------------------------------

A maximum of 1,965,259 Warrants (subject to adjustment as herein provided) are hereby created and authorized to be issued in
accordance with the terms and conditions hereof. By written order of the Corporation, the Warrant Agent shall deliver Warrant Certificates to Registered Warrantholders and record the name of the Registered Warrantholders on the Warrant register.
Registration of interests in Warrants held by the Depository may be evidenced by a position appearing on the register for Warrants of the Warrant Agent for an amount representing the aggregate number of such Warrants outstanding from time to time.
The Warrant Agent is hereby appointed Warrant Agent in respect of the Warrants.



|2.2 | Terms of Warrants.
|--- | ------------------



|(a) | Subject to the applicable conditions for exercise set out in Article 3 having been satisfied and subject
to adjustment in accordance with Article 4, each Warrant shall entitle each Warrantholder thereof, upon exercise at any time after the Issue Date and prior to the Expiry Time, to acquire one Common Share upon payment of the Exercise Price.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | No fractional Warrants shall be issued or otherwise provided for hereunder and Warrants may only be exercised
in a sufficient number to acquire whole numbers of Common Shares. If any fractional interest in such securities would, except for the provisions of this Section, be deliverable hereunder, the number of Warrants or Common Shares, as the case may be,
issuable by the Corporation shall be rounded down to the nearest whole number of Warrants or Common Shares, as the case may be, to be issued in accordance with this Indenture.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Each Warrant shall entitle the holder thereof to such other rights and privileges as are set forth in this
Indenture.
|--- | ---------------------------------------------------------------------------------------------------------------------



|(d) | The number of Common Shares which may be purchased pursuant to the Warrants and the Exercise Price therefor
shall be adjusted upon the events and in the manner specified in Article 4.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(e) | If at any time at least four months after the Effective Date, the volume weighted average trading price of the
Common Shares shall equal or exceed $2.65 for a period of twenty (20) consecutive trading days on TSXV, the Corporation shall be entitled, at the option of the Corporation, to exercise the Acceleration Right by delivering an Acceleration Notice
to the Warrantholders. An Acceleration Notice shall be delivered to each Warrantholder in the manner in Section 10.1.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|2.3 | Warrantholder not a Shareholder.
|--- | --------------------------------

Except as may be specifically provided herein, nothing in this Indenture or in the holding of a Warrant Certificate,
entitlement to a Warrant or otherwise, shall, in itself, confer or be construed as conferring upon a Warrantholder any right or interest whatsoever as a Shareholder, including, but not limited to, the right to vote at, to receive notice of, or to
attend, meetings of



---



- 8 -



Shareholders or any other proceedings of the Corporation, or the right to Dividends and other
allocations.



|2.4 | Warrants to Rank Pari Passu.
|--- | ----------------------------

All Warrants shall rank equally and without preference over each other, whatever may be the actual date of issue thereof.



|2.5 | Form of Warrants and Certificated Warrants.
|--- | -------------------------------------------

The Warrants may be issued in both certificated and uncertificated form. Each Warrant originally issued to a U.S.
Warrantholder will be evidenced in certificated form only and bear the applicable legends as set forth in Schedule A hereto. All Warrants issued in certificated form shall be evidenced by one or more Warrant Certificates (including all
replacements issued in accordance with this Indenture), substantially in the form set out in Schedule A hereto, which shall be dated as of the Issue Date, shall bear such distinguishing letters and numbers as the Corporation may, with
the approval of the Warrant Agent, prescribe, and shall be issuable in any denomination excluding fractions. All Warrants issued to the Depository may be in either a certificated or uncertificated form, such uncertificated form being evidenced by a
book position on the register of Warrantholders to be maintained by the Warrant Agent in accordance with Section 2.6.

Each Warrantholder, by purchasing Warrants, acknowledges and agrees that the terms and conditions set forth in the form of
Warrant Certificate set out in Schedule A hereto shall apply to all Warrants and Warrantholders, regardless of whether such Warrants are issued in certificated or uncertificated form, or whether such Warrantholders are Registered
Warrantholders or owners of Warrants who beneficially hold securities entitlements in respect of the Warrants through a Book Based Participant.



|2.6 | Beneficial Holders of Warrants.
|--- | -------------------------------



|(a) | The Warrants may be represented in the form of one or more CDS Global Warrants registered in the name of the
Depositary or its nominee and held by, or on behalf of, the Depositary, as depositary of the CDS Global Warrants for the Book Based Participants, and any such CDS Global Warrant will bear, or be deemed to bear the legend included in section 2.8(c)
hereto.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Registration of beneficial interests in and transfers of Warrants held by the Depository shall be made only
through the Book Based System and no Warrant Certificates shall be issued in respect of such Warrants except where physical certificates evidencing ownership in such securities are required or as set out herein or as may be requested by a
Depository, as determined by the Corporation, from time to time. Except as provided in this Section 2.6, owners of beneficial interests in any CDS Global Warrants shall not be entitled to have Warrants registered in their names and shall not
receive or be entitled to receive Warrants in definitive form or to have their names appear in the register referred to in Section 2.9 herein.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Notwithstanding any other provision in this Indenture, no CDS Global Warrants may be exchanged in whole or in
part for registered Warrants, and no transfer of any CDS
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 9 -



| | Global Warrant in whole or in part may be registered, in the name of any Person other than the Depository for
such CDS Global Warrants or a nominee thereof unless:
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (i) | the Depository notifies the Corporation that it is unwilling or unable to continue to act as depository in
connection with the Book Based Warrants and the Corporation is unable to locate a qualified successor;
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | the Corporation determines that the Depository is no longer willing, able or qualified to discharge properly
its responsibilities as holder of the CDS Global Warrants and the Corporation is unable to locate a qualified successor;
| | ---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iii) | the Depository ceases to be a clearing agency or otherwise ceases to be eligible to be a depository and the
Corporation is unable to locate a qualified successor;
| | ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iv) | the Corporation determines that the Warrants shall no longer be held as Book Based Warrants through the
Depository;
| | ---- | -------------------------------------------------------------------------------------------------------------------



| | (v) | such right is required by Applicable Law, as determined by the Corporation and the Corporations Counsel;
| | --- | ---------------------------------------------------------------------------------------------------------



| | (vi) | the Warrant is to be Authenticated to or for the account or benefit of a person in the United States or a U.S.
Person; or
| | ---- | -------------------------------------------------------------------------------------------------------------------------



| | (vii) | such registration is effected in accordance with the Internal Procedures of the Depository and the Warrant
Agent,
| | ----- | -----------------------------------------------------------------------------------------------------------------

following which Warrants for those holders requesting the same shall be registered and issued to
the beneficial owners of such Warrants or their nominees as directed by the holder. The Corporation shall provide an Officers Certificate giving notice to the Warrant Agent of the occurrence of any event outlined in this Section 2.6(b)(i)
and (vi).



|(d) | Subject to the provisions of this Section 2.6, any exchange of CDS Global Warrants for Warrants which are
not CDS Global Warrants may be made in whole or in part in accordance with the provisions of Section 2.11, mutatis mutandis. All such Warrants issued in exchange for a CDS Global Warrant or any portion thereof shall be registered in such
names as the Depository for such CDS Global Warrants shall direct and shall be entitled to the same benefits and subject to the same terms and conditions (except insofar as they relate specifically to CDS Global Warrants) as the CDS Global Warrants
or portion thereof surrendered upon such exchange.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(e) | Every Warrant that is Authenticated upon registration or transfer of a CDS Global Warrant, or in exchange for
or in lieu of a CDS Global Warrant or any portion thereof, whether pursuant to this Section 2.6, or otherwise, shall be Authenticated in the form of, and shall be, a CDS Global Warrant, unless such Warrant is registered in the name of a person
other than the Depository for such CDS Global Warrant or a nominee thereof.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(f) | Notwithstanding anything to the contrary in this Indenture, subject to Applicable Law, the CDS Global Warrant
will be issued as an Uncertificated Warrant, unless otherwise requested in writing by the Depository or the Corporation.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 10 -



|(g) | The rights of beneficial owners of Warrants who hold securities entitlements in respect of the Warrants
through the Book Based System shall be limited to those established by applicable law and agreements between the Depository and the Book Based Participants and between such Book Based Participants and the beneficial owners of Warrants who hold
securities entitlements in respect of the Warrants through the Book Based System, and such rights must be exercised through a Book Based Participant in accordance with the rules and procedures of the Depository.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(h) | Notwithstanding anything herein to the contrary, neither the Corporation nor the Warrant Agent nor any agent
thereof shall have any responsibility or liability for:
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (i) | any aspects of the records relating to any beneficial ownership interests or any other interests in the
Warrants or the Book Based System, or payments made by the Depository or its nominee on account of any beneficial ownership interest or any other interest of any person in any Warrant represented by an electronic position in the Book Based System;
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | for maintaining, supervising or reviewing any records of the Depository or its nominee or any Book Based
Participant relating to any such interest; or
| | ---- | ------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iii) | any advice or representation made or given by the Depository or those contained herein that relate to the
rules and regulations of the Depository or any action to be taken by the Depository on its own direction or at the direction of any Book Based Participant.
| | ----- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(i) | The Corporation may terminate the application of this Section 2.6 in its sole discretion in which case
all Warrants shall be evidenced by Warrant Certificates registered in the name of a Person other than the Depository.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|2.7 | Warrant Certificate.
|--- | --------------------



|(a) | For Warrants issued in certificated form, the form of certificate representing Warrants shall be substantially
as set out in Schedule A hereto or such other form as is authorized from time to time by the Warrant Agent. Each Warrant Certificate shall be Authenticated manually on behalf of the Warrant Agent. Each Warrant Certificate shall be signed
by any authorized signatory of the Corporation; whose signature shall appear on the Warrant Certificate and may be printed, lithographed or otherwise mechanically reproduced thereon and, in such event, certificates so signed are as valid and binding
upon the Corporation as if it had been signed manually. Any Warrant Certificate which is signed by any authorized signatory of the Corporation as hereinbefore provided shall be valid notwithstanding that one or more of the person(s) whose signature
is printed, lithographed or mechanically reproduced no longer holds office at the date of issuance of such certificate. The Warrant Certificates may be engraved, printed or lithographed, or partly in one form and partly in another, as the Warrant
Agent may determine.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | The Warrant Agent shall Authenticate Uncertificated Warrants (whether upon original issuance, exchange,
registration of transfer, partial payment or otherwise) by completing its Internal Procedures and the Corporation shall, and hereby acknowledges that it shall, thereupon be deemed to have duly and validly issued such Uncertificated Warrants
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 11 -



| | under this Indenture. Such Authentication shall be conclusive evidence that such Uncertificated Warrant has
been duly issued hereunder and that the holder or holders are entitled to the benefits of this Indenture. The register shall be final and conclusive evidence as to all matters relating to Uncertificated Warrants with respect to which this Indenture
requires the Warrant Agent to maintain records or accounts. In case of differences between the register at any time and any other time, the register at the later time shall be controlling, absent manifest error and such Uncertificated Warrants are
binding on the Corporation.
| | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Any Warrant Certificate validly issued in accordance with the terms of this Indenture in effect at the time of
issue of such Warrant Certificate shall, subject to the terms of this Indenture and applicable law, validly entitle the holder to acquire Common Shares, notwithstanding that the form of such Warrant Certificate may not be in the form currently
required by this Indenture.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(d) | No Certificated Warrant shall be considered issued and Authenticated or, if Authenticated, shall be obligatory
or shall entitle the holder thereof to the benefits of this Indenture, until it has been Authenticated by manual signature by or on behalf of the Warrant Agent substantially in the form of the Warrant set out in Schedule A hereto. Such
Authentication on any such Certificated Warrant shall be conclusive evidence that such Certificated Warrant is duly Authenticated and is valid and a binding obligation of the Corporation and that the holder is entitled to the benefits of this
Indenture.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(e) | No Uncertificated Warrant shall be considered issued and shall be obligatory or shall entitle the holder
thereof to the benefits of this Indenture, until it has been Authenticated by entry on the register of the particulars of the Uncertificated Warrant. Such entry on the register of the particulars of an Uncertificated Warrant shall be conclusive
evidence that such Uncertificated Warrant is a valid and binding obligation of the Corporation and that the holder is entitled to the benefits of this Indenture.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(f) | The Authentication by the Warrant Agent of any Warrants by way of entry on the register shall not be construed
as a representation or warranty by the Warrant Agent as to the validity of this Indenture or of such Warrants (except the due Authentication thereof) or as to the performance by the Corporation of its obligations under this Indenture and the Warrant
Agent shall in no respect be liable or answerable for the use made of the Warrants or any of them or the proceeds thereof.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|2.8 | Legends.
|--- | --------



|(a) | Neither the Warrants nor the Common Shares issuable upon exercise of the Warrants have been or will be
registered under the U.S. Securities Act or under any United States state securities laws. If applicable, each Warrant Certificate originally issued for the benefit or account of a U.S. Warrantholder and each Warrant Certificate issued in exchange
therefor or in substitution thereof, shall bear the following legends or such variations thereof as the Corporation may prescribe from time to time:
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

THIS WARRANT AND THE SECURITIES DELIVERABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES
ACT OF 1933, AS AMENDED (THE U.S. SECURITIES ACT), OR



---



- 12 -



ANY STATE SECURITIES LAWS, AND MAY BE OFFERED, SOLD, PLEDGED OR OTHERWISE
TRANSFERRED, DIRECTLY OR INDIRECTLY, ONLY (A) TO ACASTI PHARMA INC. (THE CORPORATION) (B) OUTSIDE THE UNITED STATES IN COMPLIANCE WITH RULE 904 OF REGULATION S UNDER THE U.S. SECURITIES ACT AND IN COMPLIANCE WITH APPLICABLE
LOCAL LAWS AND REGULATIONS, (C) WITHIN THE UNITED STATES IN ACCORDANCE WITH THE EXEMPTION FROM REGISTRATION UNDER THE U.S. SECURITIES ACT PROVIDED BY (1) RULE 144A UNDER THE U.S. SECURITIES ACT OR (2) IF AVAILABLE, RULE 144 UNDER THE
U.S. SECURITIES ACT AND, IN EACH CASE, IN COMPLIANCE WITH APPLICABLE STATE SECURITIES LAWS, OR (D) IN A TRANSACTION THAT DOES NOT REQUIRE REGISTRATION UNDER THE U.S. SECURITIES ACT OR ANY APPLICABLE STATE SECURITIES LAWS, PROVIDED THAT IN THE
CASE OF TRANSFERS PURSUANT TO (C)(2) OR (D) ABOVE, A LEGAL OPINION SATISFACTORY TO THE CORPORATION MUST FIRST BE PROVIDED TO COMPUTERSHARE TRUST COMPANY OF CANADA TO THE EFFECT THAT SUCH TRANSFER MAY BE EFFECTED WITHOUT REGISTRATION UNDER THE
U.S. SECURITIES ACT AND APPLICABLE STATE SECURITIES LAWS. DELIVERY OF THIS CERTIFICATE MAY NOT CONSTITUTE GOOD DELIVERY IN SETTLEMENT OF TRANSACTIONS ON STOCK EXCHANGES IN CANADA.

provided, that, if the Warrants are being sold outside the United States in accordance with Rule 904 of
Regulation S, and if the Corporation is a foreign issuer within the meaning of Regulation S at the time of sale, this legend may be removed by the transferor providing a declaration to the Warrant Agent in the form set forth in the
attached Warrant Certificate or as the Warrant Agent or the Corporation may prescribe from time to time, and if required by the Warrant Agent, including an opinion of counsel, of recognized standing reasonably satisfactory to the Corporation and the
Warrant Agent, that such legend is no longer required under the U.S. Securities Act and applicable state securities laws.



|(b) | Each Warrant Certificate and each Warrant Certificate issued in exchange therefor or in substitution thereof,
shall bear the following legends or such variations thereof as the Corporation may prescribe from time to time:
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

THE SECURITIES EVIDENCED HEREBY AND THE SECURITIES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE U.S.
SECURITIES ACT OR U.S. STATE SECURITIES LAWS. THESE WARRANTS MAY NOT BE EXERCISED IN THE UNITED STATES OR BY OR ON BEHALF OF, OR FOR THE ACCOUNT OR BENEFIT OF, A U.S. PERSON UNLESS AN EXEMPTION FROM REGISTRATION UNDER THE U.S. SECURITIES ACT AND ANY
APPLICABLE STATE SECURITIES LAWS IS AVAILABLE AND THE CORPORATION HAS RECEIVED AN OPINION OF COUNSEL OF RECOGNIZED STANDING TO SUCH EFFECT IN FORM AND SUBSTANCE REASONABLY SATISFACTORY TO THE CORPORATION. UNITED STATES AND U.S.
PERSON ARE AS DEFINED BY REGULATION S UNDER THE U.S. SECURITIES ACT. IF REQUESTED BY THE CORPORATION, THE HOLDER AGREES TO



---



- 13 -



PROVIDE THE INFORMATION NECESSARY TO DETERMINE WHETHER THE TRANSFER OR EXERCISE
OF THIS WARRANT IS PERMISSIBLE UNDER THE U.S. SECURITIES ACT.



|(c) | The Warrant Agent shall be entitled to request any other documents that it may require in accordance with its
internal policies for the removal of the legend set forth above.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(d) | Each CDS Global Warrant originally issued in Canada and held by the Depository, and each CDS Global Warrant
issued in exchange therefor or in substitution thereof shall bear or be deemed to bear the following legend or such variations thereof as the Corporation may prescribe from time to time:
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF CDS CLEARING AND DEPOSITORY SERVICES INC.
(CDS) TO ACASTI PHARMA INC. (THE ISSUER) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IN RESPECT THEREOF IS REGISTERED IN THE NAME OF CDS & CO, OR IN SUCH
OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF CDS (AND ANY PAYMENT IS MADE TO CDS & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF CDS), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED HOLDER HEREOF, CDS & CO., HAS A PROPERTY INTEREST IN THE SECURITIES REPRESENTED BY THIS CERTIFICATE HEREIN AND IT IS A VIOLATION OF ITS RIGHTS FOR ANOTHER PERSON TO HOLD,
TRANSFER OR DEAL WITH THIS CERTIFICATE.



|(e) | Notwithstanding any other provisions of this Indenture, in processing and registering transfers of Warrants,
no duty or responsibility whatsoever shall rest upon the Warrant Agent to determine the compliance by any transferor or transferee with the terms of the legend contained in subsections 2.8(a) or 2.8(c), or with the relevant securities laws or
regulations, including, without limitation, Regulation S, and the Warrant Agent shall be entitled to assume that all transfers are legal and proper.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|2.9 | Register of Warrants
|--- | --------------------



|(a) | The Warrant Agent shall maintain records and accounts concerning the Warrants, whether certificated or
uncertificated, which shall contain the information called for below with respect to each Warrant, together with such other information as may be required by law or as the Warrant Agent may elect to record. All such information shall be kept in one
set of accounts and records which the Warrant Agent shall designate (in such manner as shall permit it to be so identified as such by an unaffiliated party) as the register of the holders of Warrants. The information to be entered for each account
in the register of Warrants at any time shall include (without limitation):
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (i) | the name and address of the holder of the Warrants, the date of Authentication thereof and the number of
Warrants;
| | --- | ------------------------------------------------------------------------------------------------------------------



---



- 14 -



| | (ii) | whether such Warrant is a Certificated Warrant or an Uncertificated Warrant and, if a Warrant Certificate, the
unique number or code assigned to and imprinted thereupon and, if an Uncertificated Warrant, the unique number or code assigned thereto if any;
| | ---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iii) | whether such Warrant has been cancelled; and
| | ----- | --------------------------------------------



| | (iv) | a register of transfers in which all transfers of Warrants and the date and other particulars of each transfer
shall be entered.
| | ---- | --------------------------------------------------------------------------------------------------------------------------------

The register shall be available for inspection by the Corporation and or any
Warrantholder during the Warrant Agents regular business hours on a Business Day and upon payment to the Warrant Agent of its reasonable fees. Any Warrantholder exercising such right of inspection shall first provide an affidavit in form
satisfactory to the Corporation and the Warrant Agent stating the name and address of the Warrantholder and agreeing not to use the information therein except in connection with an effort to call a meeting of Warrantholders or to influence the
voting of Warrantholders at any meeting of Warrantholders.



|(b) | Once an Uncertificated Warrant has been Authenticated, the information set forth in the register with respect
thereto at the time of Authentication may be altered, modified, amended, supplemented or otherwise changed only to reflect exercise or proper instructions to the Warrant Agent from the holder as provided herein, except that the Warrant Agent may act
unilaterally to make purely administrative changes internal to the Warrant Agent and changes to correct errors. Each person who becomes a holder of an Uncertificated Warrant, by his, her or its acquisition thereof shall be deemed to have irrevocably
consented to the foregoing authority of the Warrant Agent to make such error corrections.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|2.10 | Issue in Substitution for Warrant Certificates Lost, etc.
|---- | ---------------------------------------------------------



|(a) | If any Warrant Certificate becomes mutilated or is lost, destroyed or stolen, the Corporation, subject to
applicable law, shall issue and thereupon the Warrant Agent shall certify and deliver, a new Warrant Certificate of like tenor, and bearing the same legend, if applicable, as the one mutilated, lost, destroyed or stolen in exchange for and in place
of and upon cancellation of such mutilated Warrant Certificate, or in lieu of and in substitution for such lost, destroyed or stolen Warrant Certificate, and the substituted Warrant Certificate shall be in a form approved by the Warrant Agent and
the Warrants evidenced thereby shall be entitled to the benefits hereof and shall rank equally in accordance with its terms with all other Warrants issued or to be issued hereunder.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | The applicant for the issue of a new Warrant Certificate pursuant to this Section 2.10 shall bear the
cost of the issue thereof and in case of loss, destruction or theft shall, as a condition precedent to the issuance thereof, furnish to the Corporation and to the Warrant Agent such evidence of ownership and of the loss, destruction or theft of the
Warrant Certificate so lost, destroyed or stolen as shall be satisfactory to the Corporation and to the Warrant Agent, in their sole discretion, and such applicant shall also be required to furnish an indemnity and surety bond in amount and form
satisfactory to the
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 15 -



| | Corporation and the Warrant Agent, in their sole discretion, and shall pay the reasonable charges of the
Corporation and the Warrant Agent in connection therewith.
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------



|2.11 | Exchange of Warrant Certificates.
|---- | ---------------------------------



|(a) | Any one or more Warrant Certificates representing any number of Warrants may, upon compliance with the
reasonable requirements of the Warrant Agent (including compliance with Applicable Securities Laws), be exchanged for one or more other Warrant Certificates representing the same aggregate number of Warrants and bearing the same legend, if
applicable, as represented by the Warrant Certificate or Warrant Certificates so exchanged.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Warrant Certificates may be exchanged only at the Warrant Agency or at any other place that is designated by
the Corporation with the approval of the Warrant Agent. Any Warrant Certificate or duly executed Transaction Instruction from the holder (or such other instructions, in form satisfactory to the Warrant Agent), tendered for exchange shall be
surrendered to the Warrant Agency and cancelled by the Warrant Agent.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Warrant Certificates exchanged for Warrant Certificates that bear a legend set forth in Section 2.8 shall
bear the same legend.
|--- | -------------------------------------------------------------------------------------------------------------------------------



|2.12 | Transfer and Ownership of Warrants.
|---- | -----------------------------------



|(a) | The Warrants may only be transferred on the register kept by the Warrant Agent at the Warrant Agency by the
holder or its legal representatives or its attorney duly appointed by an instrument in writing in form and execution satisfactory to the Warrant Agent only upon (a) in the case of a Warrant Certificate, surrendering to the Warrant Agent at the
Warrant Agency the Warrant Certificate representing the Warrants to be transferred together with a duly executed transfer form as set forth in Schedule B, (b) in the case of Book Based Warrants, in accordance with procedures
prescribed by the Depository under the Book Based System, (c) in the case of Uncertificated Warrants, surrendering to the Warrant Agent at the Warrant Agency, a duly executed Transaction Instruction from the holder (or such other instructions,
in form satisfactory to the Warrant Agent), and (d) upon compliance with:
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (i) | the conditions herein;
| | --- | ----------------------



| | (ii) | such reasonable requirements as the Warrant Agent may prescribe; and
| | ---- | --------------------------------------------------------------------



| | (iii) | all Applicable Securities Laws and requirements of regulatory authorities;
| | ----- | --------------------------------------------------------------------------

and such transfer shall be duly noted in such register by the Warrant Agent. Upon compliance with such requirements, the
Warrant Agent shall issue to the transferee of a Certificated Warrant (or it shall Authenticate an Uncertificated Warrant instead, upon request), a Warrant Certificate, and to the transferee of an Uncertificated Warrant, an Uncertificated Warrant
(or it shall Authenticate and deliver a Certificated Warrant instead, upon request), representing the Warrants transferred and the transferee of a Book Based Warrant shall be recorded through the relevant Book Based Participant in accordance with
the Book Based System as the entitlement holder in respect of such



---



- 16 -



Warrants. Transfers within the Book Based System are not the responsibility of
the Warrant Agent and will not be noted on the register maintained by the Warrant Agent.



|(b) | If a Warrant Certificate tendered for transfer bears the legend set forth in Section 2.8(a), the Warrant
Agent shall not register such transfer unless the transferor has provided the Warrant Agent with the Warrant Certificate and (i) the transfer is made to the Corporation or (ii) a declaration to the effect set forth in Schedule C to this
Warrant Indenture, or in such other form as the Corporation may from time to time prescribe, is delivered to the Warrant Agent, and if required by the Warrant Agent, the transferor provides an opinion of counsel of recognized standing, reasonably
satisfactory to the Corporation and the Warrant Agent that the transfer is in compliance with applicable state laws and the U.S. Securities Act.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Subject to the provisions of this Indenture and Applicable Legislation, the Warrantholder shall be entitled to
the rights and privileges attaching to the Warrants, and the issue of Common Shares by the Corporation upon the exercise of Warrants in accordance with the terms and conditions herein contained shall discharge all responsibilities of the Corporation
and the Warrant Agent with respect to such Warrants and neither the Corporation nor the Warrant Agent shall be bound to inquire into the title of any such holder.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|2.13 | Cancellation of Surrendered Warrants.
|---- | -------------------------------------

All Warrant Certificates surrendered pursuant to Article 3 shall be cancelled by the Warrant Agent and upon such circumstances
all such Uncertificated Warrants shall be deemed cancelled and so noted on the register by the Warrant Agent. Upon request by the Corporation, the Warrant Agent shall furnish to the Corporation a cancellation certificate identifying the Warrant
Certificates so cancelled, the number of Warrants evidenced thereby, the number of Common Shares, if any, issued pursuant to such Warrants and the details of any Warrant Certificates issued in substitution or exchange for such Warrant Certificates
cancelled.

ARTICLE 3

EXERCISE OF WARRANTS



|3.1 | Right of Exercise.
|--- | ------------------

Subject to the provisions hereof, each Registered Warrantholder may exercise the right conferred on such holder to subscribe
for and purchase one Common Share for each Warrant after the Issue Date and prior to the Expiry Time and in accordance with the conditions herein.

Notwithstanding any provision to the contrary contained in this Indenture, no U.S. Warrantholder may exercise any Warrant
unless an exemption from the registration requirements of the U.S. Securities Act is available and such holder provides evidence, including an opinion of counsel, of the availability of such exemption reasonably satisfactory to the Corporation and
the Warrant Agent; provided, however, that a U.S. Warrantholder that is the original purchaser of Warrants and delivered to the Corporation a U.S. Accredited Investor Certificate in connection with its purchase of Units pursuant to the
U.S. Placement will not be required to deliver an opinion of counsel in connection with the exercise of the Warrants, unless reasonably requested by the Corporation.



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|3.2 | Warrant Exercise.
|--- | -----------------



|(a) | Registered Warrantholders of Warrant Certificates who wish to exercise the Warrants held by them in order to
acquire Common Shares must complete a Transaction Instruction or the exercise form (the Exercise Notice) attached to the Warrant Certificate(s) in the form set forth in Schedule C hereto, which may be amended by
the Corporation with the consent of the Warrant Agent, if such amendment does not, in the reasonable opinion of the Corporation and the Warrant Agent, which may be based on the advice of Counsel, materially and adversely affect the rights,
entitlements and interests of the Warrantholders, and deliver such certificate(s), if applicable, the executed Exercise Notice and a certified cheque, bank draft or money order payable to or to the order of the Corporation for the aggregate Exercise
Price to the Warrant Agent at the Warrant Agency. The Warrants represented by a Warrant Certificate shall be deemed to be surrendered upon personal delivery of such certificate, Exercise Notice and aggregate Exercise Price or, if such documents are
sent by mail or other means of transmission, upon actual receipt thereof by the Warrant Agent at the office referred to above.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | In addition to completing the Exercise Form attached to the Warrant Certificate(s), a U.S. Warrantholder, or
any other person requesting delivery of the Common Shares issuable upon exercise of the Warrants in or into the United States must (a) provide a completed and executed U.S. Purchaser Letter or (b) an opinion of counsel of recognised
standing in form and substance reasonably satisfactory to the Corporation and the Warrant Agent that the exercise and delivery is exempt from the registration requirements of Applicable Securities Laws of any state of the United States and the U.S.
Securities Act; provided, however a U.S. Warrantholder that is the original purchaser of Warrants and who has delivered the U.S. Accredited Investor Certificate attached to the subscription agreement of the Corporation in connection with its
purchase of Units pursuant to the U.S. Placement, will not be required to deliver a U.S. Purchaser Letter or an opinion of counsel in connection with the due exercise of the Warrant at a time when the representations, warranties and covenants made
by the Warrantholder in the U.S. Accredited Investor Certificate remain true and correct and the Warrantholder certifies to the Corporation as such.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | A Registered Warrantholder of Uncertificated Warrants evidenced by a security entitlement in respect of
Warrants must complete the Exercise Notice and deliver the executed Exercise Notice and a certified cheque, bank draft or money order payable to or to the order of the Corporation for the aggregate Exercise Price to the Warrant Agent at the Warrant
Agency. The Uncertificated Warrants shall be deemed to be surrendered upon receipt of the duly completed and executed Exercise Notice and payment of the applicable Exercise Price or, if such documents are sent by mail or other means of transmission,
upon actual receipt thereof by the Warrant Agent at the office referred to above.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(d) | A beneficial owner of Warrants evidenced by a security entitlement in respect of Warrants in the Book Based
System who desires to exercise his or her Warrants must do so by causing a Book Based Participant to deliver to the Depository on behalf of the entitlement holder, notice of the owners intention to exercise Warrants in a manner acceptable to
the Depository. Forthwith upon receipt by the Depository of such notice,
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| | as well as payment for the aggregate Exercise Price, the Depository shall deliver to the Warrant Agent
confirmation of its intention to exercise Warrants (Confirmation) in a manner acceptable to the Warrant Agent, including by electronic means through a book based registration system, including CDSX. An electronic exercise of the
Warrants initiated by the Book Based Participant through a book based registration system, including CDSX, shall constitute a representation to both the Corporation and the Warrant Agent that the beneficial owner at the time of exercise of such
Warrants (a) is not in the United States; (b) is not a U.S. Person and is not exercising such Warrants on behalf of a U.S. Person or a person in the United States; and (c) did not execute or deliver the notice of the owners
intention to exercise such Warrants in the United States. If the CDS Participant is not able to make or deliver the foregoing representation by initiating the electronic exercise of the Warrants, then such Warrants shall be withdrawn from the book
based registration system, including CDSX by the CDS Participant and an individually registered Warrant Certificate shall be issued by the Warrant Agent to such Beneficial Owner or CDS Participant and the exercise procedures set forth in
Section 3.2(a) shall be followed.
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(e) | Payment representing the aggregate Exercise Price must be provided to the appropriate office of the Book Based
Participant in a manner acceptable to it. A notice in form acceptable to the Book Based Participant and payment from such beneficial holder should be provided to the Book Based Participant sufficiently in advance so as to permit the Book Based
Participant to deliver notice and payment to the Depository and for the Depository in turn to deliver notice and payment to the Warrant Agent prior to the Expiry Time. The Depository will initiate the exercise by way of the Confirmation and forward
the aggregate Exercise Price electronically to the Warrant Agent and the Warrant Agent will execute the exercise by issuing to the Depository through the Book Based System the Common Shares to which the exercising Warrantholder is entitled pursuant
to the exercise. Any expense associated with the exercise process will be for the account of the entitlement holder exercising the Warrants and/or the Book Based Participant exercising the Warrants on its behalf.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(f) | By causing a Book Based Participant to deliver notice to the Depository, a Warrantholder shall be deemed to
have irrevocably surrendered his or her Warrants so exercised and appointed such Book Based Participant to act as his or her exclusive settlement agent with respect to the exercise and the receipt of Common Shares in connection with the obligations
arising from such exercise.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(g) | Any notice which the Depository determines to be incomplete, not in proper form or not duly executed shall for
all purposes be void and of no effect and the exercise to which it relates shall be considered for all purposes not to have been exercised thereby. A failure by a Book Based Participant to exercise or to give effect to the settlement thereof in
accordance with the Warrantholders instructions will not give rise to any obligations or liability on the part of the Corporation or Warrant Agent to the Book Based Participant or the Warrantholder.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(h) | Any exercise form or Exercise Notice referred to in this Section 3.2 shall be signed by the Registered
Warrantholder, or its executors or administrators or other legal representatives or an attorney of the Registered Warrantholder, duly appointed by an
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| | instrument in writing satisfactory to the Warrant Agent but such exercise form need not be executed by the
Depository.
| | ----------------------------------------------------------------------------------------------------------------------



|(i) | Any exercise referred to in this Section 3.2 shall require that the entire Exercise Price for Common
Shares subscribed must be paid at the time of subscription and such Exercise Price and original Exercise Notice executed by the Registered Warrantholder or the Confirmation from the Depository must be received by the Warrant Agent prior to the
Expiry Time.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(j) | Warrants may only be exercised pursuant to this Section 3.2 by or on behalf of a Registered
Warrantholder, as applicable, who makes the certifications set forth on the Exercise Notice set out in Schedule C or as provided herein.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(k) | If the form of Exercise Notice set forth in the Warrant Certificate shall have been amended, the Corporation
shall cause the amended Exercise Notice to be forwarded to all Registered Warrantholders.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(l) | Exercise Notices and Confirmations must be delivered to the Warrant Agent at any time during the Warrant
Agents actual business hours on any Business Day prior to the Expiry Time. Any Exercise Notice or Confirmations received by the Warrant Agent after business hours on any Business Day other than the Expiry Date will be deemed to have been
received by the Warrant Agent on the next following Business Day.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(m) | Any Warrant with respect to which an Exercise Notice or Confirmation is not received by the Warrant Agent
before the Expiry Time shall be deemed to have expired and become void and all rights with respect to such Warrants shall terminate and be cancelled.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|3.3 | Securities Restrictions.
|--- | ------------------------

Notwithstanding anything herein contained, Common Shares will be issued upon exercise of a Warrant only in compliance with the
securities laws of any applicable jurisdiction, including without limitation the Applicable Securities Laws, and, without limiting the generality of the foregoing, the Corporation will direct the Warrant Agent to legend any certificates representing
the Common Shares if, in the opinion of counsel to the Corporation acting reasonably, such legend is necessary in order to avoid a violation of such securities laws or to comply with the requirements of any stock exchange on which the Common Shares
are listed; provided that if, at any time, in the opinion of counsel to the Corporation, acting reasonably, such legends are no longer necessary in order to avoid a violation of any such laws, or the holder of any such legended certificate, at his
or her expense, provides the Corporation with evidence in form and substance reasonably satisfactory to the Corporation (which may include an opinion of Counsel of recognized standing in form and substance reasonably satisfactory to the Corporation)
to the effect that such holder is entitled to sell or otherwise transfer such Common Shares in a transaction in which such legends are not required, such legended certificates may thereafter be surrendered to the Warrant Agent in exchange for a
certificate which does not bear such legends.

The Warrant Agent shall be entitled to assume that Common Shares may be
issued pursuant to the exercise of any Warrant without violating any Applicable Securities Laws and without legending the certificate representing the Common Shares unless the Warrant Agent has



---



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received notice in writing from the Corporation stating otherwise and setting forth the
restrictions on the exercise of the Warrants and any legend the certificates representing the Common Shares should bear.



|3.4 | Prohibition on Exercise by U.S. Persons; Legended Certificates
|--- | --------------------------------------------------------------



|(a) | Subject to Section 3.2(b) and Section 3.4(b), (i) Warrants may not be exercised within the
United States or by or on behalf of any U.S. Warrantholders; and (ii) no Common Shares issued upon exercise of Warrants may be delivered to any address in the United States.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Notwithstanding Section 3.4(a), Warrants which bear the legend set forth in Section 2.8(a) and
2.8(b) may be exercised in the United States or by or on behalf of a U.S. Warrantholder, and Common Shares issued upon exercise of any such Warrants may be delivered to an address in the United States, provided that (a) the Person exercising
the Warrants (i) is an original U.S. Purchaser who purchased the Warrants directly from the Corporation, (ii) is an institutional accredited investor that satisfies one or more of the criteria set forth in Rule
501(a)(1), (2), (3) or (7) of Regulation D and (b) delivers a completed and executed U.S. Purchaser Letter or provides in form and substance satisfactory to the Corporation and Warrant Agent a legal opinion which confirms that
issuance of shares without registration under the U.S. Securities Act is in compliance with the applicable state laws and the U.S. Securities Act; provided however that in the case of a U.S. Warrantholder that is the original purchaser
of the Warrants and who delivered the U.S. Accredited Investor Certificate to the Corporation in connection with its purchase of Units pursuant to the U.S. Placement, such Warrantholder will not be required to deliver a U.S. Purchaser Letter or an
opinion of counsel in connection with the exercise of the Warrant at a time when the representations, warranties and covenants made by the Warrantholder in the U.S. Accredited Investor Certificate remain true and correct and the Warrantholder
certifies to the Corporation as such.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Certificates representing Common Shares issued upon the exercise of Warrants which bear the legend set forth
in Sections 2.8(a) and 2.8(b) and which are issued and delivered pursuant to Section 3.4(b) shall bear the following legend:
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED
(THE U.S. SECURITIES ACT), OR ANY STATE SECURITIES LAWS, AND MAY BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED, DIRECTLY OR INDIRECTLY, ONLY (A) TO ACASTI PHARMA INC. (THE CORPORATION) (B) OUTSIDE
THE UNITED STATES IN COMPLIANCE WITH RULE 904 OF REGULATION S UNDER THE U.S. SECURITIES ACT AND IN COMPLIANCE WITH APPLICABLE LOCAL LAWS AND REGULATIONS, (C) WITHIN THE UNITED STATES IN ACCORDANCE WITH THE EXEMPTION FROM REGISTRATION UNDER THE
U.S. SECURITIES ACT PROVIDED BY (1) RULE 144A UNDER THE U.S. SECURITIES ACT OR (2) IF AVAILABLE, RULE 144 UNDER THE U.S. SECURITIES ACT AND, IN EACH CASE, IN COMPLIANCE WITH APPLICABLE STATE SECURITIES LAWS, OR (D) IN A TRANSACTION
THAT DOES NOT REQUIRE REGISTRATION UNDER THE U.S. SECURITIES ACT OR ANY APPLICABLE STATE SECURITIES LAWS, PROVIDED THAT IN



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THE CASE OF TRANSFERS PURSUANT TO (C)(2) OR (D) ABOVE, THE HOLDER MUST
FURNISH TO THE CORPORATION AN OPINION OF COUNSEL OF RECOGNIZED STANDING IN FORM AND SUBSTANCE REASONABLY SATISFACTORY TO THE CORPORATION TO THE EFFECT THAT THE PROPOSED TRANSFER MAY BE EFFECTED WITHOUT REGISTRATION UNDER THE U.S. SECURITIES ACT OR
APPLICABLE STATE SECURITIES LAWS.

THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE LISTED ON THE TSX VENTURE EXCHANGE
(TSXV); HOWEVER, SUCH SECURITIES CANNOT BE TRADED THROUGH THE FACILITIES OF THE TSXV SINCE THEY ARE NOT FREELY TRANSFERABLE, AND CONSEQUENTLY DELIVERY OF ANY CERTIFICATE REPRESENTING SUCH SECURITIES IS NOT GOOD DELIVERY IN
SETTLEMENT OF TRANSACTIONS ON THE TSXV. PROVIDED THAT THE CORPORATION IS A FOREIGN ISSUER WITHIN THE MEANING OF REGULATION S AT THE TIME OF SALE, A NEW CERTIFICATE, BEARING NO LEGEND, DELIVERY OF WHICH WILL CONSTITUTE GOOD
DELIVERY MAY BE OBTAINED FROM COMPUTERSHARE INVESTOR SERVICES INC., AS REGISTRAR AND TRANSFER AGENT, OR SUCH OTHER ORGANIZATION OR ENTITY PERFORMING SUCH FUNCTION FOR THE CORPORATION (THE TRANSFER AGENT) UPON DELIVERY OF THIS
CERTIFICATE AND A DULY EXECUTED DECLARATION, IN A FORM SATISFACTORY TO THE TRANSFER AGENT AND THE CORPORATION, TO THE EFFECT THAT THE SALE OF THE SECURITIES REPRESENTED HEREBY IS BEING MADE IN COMPLIANCE WITH RULE 904 OF REGULATION S UNDER THE
SECURITIES ACT (AND IF REQUIRED BY THE TRANSFER AGENT OR THE CORPORATION, AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE TRANSFER AGENT AND THE CORPORATION).



|3.5 | Transfer Fees and Taxes.
|--- | ------------------------

If any of the Common Shares subscribed for are to be issued to a person or persons other than the Registered Warrantholder,
the Registered Warrantholder shall execute the form of transfer and will comply with such reasonable requirements as the Warrant Agent may stipulate and will pay to the Corporation or the Warrant Agent on behalf of the Corporation, all applicable
transfer or similar taxes and the Corporation will not be required to issue or deliver certificates evidencing Common Shares or issue Common Shares in uncertificated form unless or until such Warrantholder shall have paid to the Corporation or the
Warrant Agent on behalf of the Corporation, the amount of such tax or shall have established to the satisfaction of the Corporation and the Warrant Agent that such tax has been paid or that no tax is due.



|3.6 | Warrant Agency.
|--- | ---------------

To facilitate the exchange, transfer or exercise of Warrants and compliance with such other terms and conditions hereof as may
be required, the Corporation has appointed the Warrant Agency, as the agency at which Warrants may be surrendered for exchange or transfer or at which Warrants may be exercised and the Warrant Agent has accepted such appointment. The Corporation may
from time to time designate alternate or additional places as the Warrant Agency (subject to the Warrant Agents prior approval) and will give notice to the Warrant Agent of any proposed change of the Warrant Agency. Branch registers shall also
be kept at such



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other place or places, if any, as the Corporation, with the approval of the Warrant Agent, may
designate. The Warrant Agent will from time to time when requested to do so by the Corporation or any Registered Warrantholder, upon payment of the Warrant Agents reasonable charges, furnish a list of the names and addresses of Registered
Warrantholders showing the number of Warrants held by each such Registered Warrantholder.



|3.7 | Effect of Exercise of Warrant Certificates.
|--- | -------------------------------------------



|(a) | Upon the exercise of Warrants pursuant to and in compliance with Section 3.2 and subject to
Section 3.3 and Section 3.4, the Common Shares to be issued pursuant to the Warrants exercised shall be deemed to have been issued and the person or persons to whom such Common Shares are to be issued shall be deemed to have become the
holder or holders of record of such Common Shares on the Exercise Date, unless the register shall be closed on such date, in which case the Common Shares subscribed for shall be deemed to have been issued and such person or persons deemed to have
become the holder or holders of record of such Common Shares, on the date on which such register is reopened. It is hereby understood that in order for persons to whom Common Shares are to be issued, to become holders of Common Shares of record on
the Exercise Date, beneficial holders must commence the exercise process sufficiently in advance so that the Warrant Agent is in receipt of all items of exercise at least one Business Day prior to such Exercise Date.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | As soon as practicable, but in any event within five Business Days after the Exercise Date with respect to a
Warrant, the Warrant Agent shall cause to be delivered or mailed to the person or persons in whose name or names the Warrant is registered or, if so specified in writing by the holder, cause to be delivered to such person or persons at the Warrant
Agency where the Warrant Certificate was surrendered, a certificate or certificates for the appropriate number of Common Shares subscribed for, or any other appropriate evidence of the issuance of Common Shares to such person or persons in respect
of Common Shares issued under the Book Based System.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|3.8 | Partial Exercise of Warrants; Fractions.
|--- | ----------------------------------------



|(a) | The holder of any Warrants may exercise his right to acquire a number of whole Common Shares less than the
aggregate number which the holder is entitled to acquire. In the event of any exercise of a number of Warrants less than the number which the holder is entitled to exercise, the holder of Warrants upon such exercise shall, in addition, be entitled
to receive, without charge therefor, a new Warrant Certificate(s), bearing the same legend, if applicable, or other appropriate evidence of Warrants, in respect of the balance of the Warrants held by such holder and which were not then exercised.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Notwithstanding anything herein contained including any adjustment provided for in Section 4.1, the
Corporation shall not be required, upon the exercise of any Warrants, to issue fractions of Common Shares. Warrants may only be exercised in a sufficient number to acquire whole numbers of Common Shares.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|3.9 | Expiration of Warrants.
|--- | -----------------------

Immediately after the Expiry Time, all rights under any Warrant in respect of which the right of acquisition provided for
herein shall not have been exercised shall cease and terminate and each Warrant shall be void and of no further force or effect.



|3.10 | Accounting and Recording.
|---- | -------------------------



|(a) | The Warrant Agent shall promptly account to the Corporation with respect to Warrants exercised, and shall
promptly forward to the Corporation (or into an account or accounts of the Corporation with the bank or trust company designated by the Corporation for that purpose), all monies received by the Warrant Agent on the subscription of Common Shares
through the exercise of Warrants. All such monies and any securities or other instruments, from time to time received by the Warrant Agent shall be received in trust for, and shall be segregated and kept apart by the Warrant Agent, the
Warrantholders and the Corporation as their interests may appear.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | The Warrant Agent shall record the particulars of Warrants exercised, which particulars shall include the
names and addresses of the persons who become holders of Common Shares on exercise and the Exercise Date, in respect thereof. The Warrant Agent shall provide such particulars in writing to the Corporation within five Business Days of any request by
the Corporation therefor.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

ARTICLE 4

ADJUSTMENT OF NUMBER OF COMMON SHARES AND EXERCISE PRICE



|4.1 | Adjustment of Number of Common Shares and Exercise Price.
|--- | ---------------------------------------------------------

The subscription rights in effect under the Warrants for Common Shares issuable upon the exercise of the Warrants shall be
subject to adjustment from time to time upon the occurrence of any of the events and in the manner provided as follows:



|(a) | If and whenever, at any time during the Adjustment Period, the Corporation shall:
|--- | ---------------------------------------------------------------------------------



| | (i) | subdivide, re-divide or change its Common Shares into a greater number of Common Shares;
| | --- | ----------------------------------------------------------------------------------------



| | (ii) | reduce, combine or consolidate its outstanding Common Shares into a lesser number of Common Shares; or
| | ---- | ------------------------------------------------------------------------------------------------------



| | (iii) | issue Common Shares or securities exchangeable for, or convertible into, Common Shares to all or substantially
all of the holders of Common Shares by way of stock dividend or other distribution (other than dividends paid in the ordinary course, and other than a distribution of Common Shares upon the exercise of any outstanding warrants, options or other
securities);
| | ----- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

(any of such events in Section 4.1(a) (i) to (iii), a Common Share
Reorganization), then the Exercise Price shall be adjusted with effect on the effective date of such subdivision, re-division, change, reduction, combination, consolidation or on the record date of such distribution, as the case may be,
shall in the case of the events referred to in



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(i) or (iii) above be decreased in proportion to the number of outstanding
Common Shares resulting from such subdivision, re-division, change or distribution, or shall, in the case of the events referred to in (ii) above, be increased in proportion to the number of outstanding Common Shares resulting from such
reduction, combination or consolidation by multiplying the Exercise Price in effect immediately prior to such effective date or record date by a fraction, the numerator of which shall be the number of Common Shares outstanding on such effective date
or record date before giving effect to such Common Share Reorganization and the denominator of which shall be the number of Common Shares outstanding as of the effective date or record date after giving effect to such Common Shares Reorganization
(including, in the case where securities exchangeable for or convertible into Common Shares are distributed, the number of Common Shares that would have been outstanding had such securities been exchanged for or converted into Common Shares on such
record date or effective date). Such adjustment shall be made successively whenever any event referred to in this Section 4.1(a) shall occur. Upon any adjustment of the Exercise Price pursuant to Section 4.1(a), the Exchange Rate shall be
contemporaneously adjusted by multiplying the number of Common Shares theretofore obtainable on the exercise thereof by a fraction of which the numerator shall be the Exercise Price in effect immediately prior to such adjustment and the denominator
shall be the Exercise Price resulting from such adjustment;



|(b) | if and whenever at any time during the Adjustment Period, the Corporation shall fix a record date for the
issuance of rights, options or warrants to all or substantially all the holders of its outstanding Common Shares entitling them, for a period expiring not more than 45 days after such record date, to subscribe for or purchase Common Shares (or
securities convertible or exchangeable into Common Shares) at a price per Common Share (or having a conversion or exchange price per Common Share) less than 95% of the Current Market Price on such record date (a Rights Offering),
the Exercise Price shall be adjusted immediately after such record date so that it shall equal the amount determined by multiplying the Exercise Price in effect on such record date by a fraction, of which the numerator shall be the total number of
Common Shares outstanding on such record date plus a number of Common Shares equal to the number arrived at by dividing the aggregate price of the total number of additional Common Shares offered for subscription or purchase (or the aggregate
conversion or exchange price of the convertible or exchangeable securities so offered) by such Current Market Price, and of which the denominator shall be the total number of Common Shares outstanding on such record date plus the total number of
additional Common Shares offered for subscription or purchase or into which the convertible or exchangeable securities so offered are convertible or exchangeable; any Common Shares owned by or held for the account of the Corporation shall be deemed
not to be outstanding for the purpose of any such computation; such adjustment shall be made successively whenever such a record date is fixed; to the extent that no such rights or warrants are exercised prior to the expiration thereof, the Exercise
Price shall be readjusted to the Exercise Price which would then be in effect if such record date had not been fixed or, if any such rights or warrants are exercised, to the Exercise Price which would then be in effect based upon the number of
Common Shares (or securities convertible or exchangeable into Common Shares) actually issued upon the exercise of such rights or warrants, as the case may be. Upon any adjustment of the Exercise Price pursuant to this Section 4.1(b), the
Exchange Rate
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 25 -



| | will be adjusted immediately after such record date so that it will equal the rate determined by multiplying
the Exchange Rate in effect on such record date by a fraction, of which the numerator shall be the Exercise Price in effect immediately prior to such adjustment and the denominator shall be the Exercise Price resulting from such adjustment. Such
adjustment will be made successively whenever such a record date is fixed, provided that if two or more such record dates or record dates referred to in this Section 4.1(b) are fixed within a period of 25 Trading Days, such adjustment will be
made successively as if each of such record dates occurred on the earliest of such record dates;
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | if and whenever at any time during the Adjustment Period the Corporation shall fix a record date for the
making of a distribution to all or substantially all the holders of its outstanding Common Shares of (i) securities of any class, whether of the Corporation or any other entity (other than Common Shares), (ii) rights, options or warrants
to subscribe for or purchase Common Shares (or other securities convertible into or exchangeable for Common Shares), other than pursuant to a Rights Offering; (iii) evidences of its indebtedness or (iv) any property or other assets (other
than cash dividends paid in the normal course) then, in each such case, the Exercise Price shall be adjusted immediately after such record date so that it shall equal the price determined by multiplying the Exercise Price in effect on such record
date by a fraction, of which the numerator shall be the total number of Common Shares outstanding on such record date multiplied by the Current Market Price on such record date, less the excess, if any, of the fair market value on such record date,
as determined by the Corporation (whose determination shall be conclusive), of such securities or other assets so issued or distributed over the fair market value of any consideration received therefor by the Corporation from the holders of the
Common Shares, and of which the denominator shall be the total number of Common Shares outstanding on such record date multiplied by the Current Market Price on such record date; and Common Shares owned by or held for the account of the Corporation
shall be deemed not to be outstanding for the purpose of any such computation; such adjustment shall be made successively whenever such a record date is fixed; to the extent that such distribution is not so made, the Exercise Price shall be
readjusted to the Exercise Price which would then be in effect if such record date had not been fixed. Upon any adjustment of the Exercise Price pursuant to this Section 4.1(c), the Exchange Rate will be adjusted immediately after such record
date so that it will equal the rate determined by multiplying the Exchange Rate in effect on such record date by a fraction, of which the numerator shall be the Exercise Price in effect immediately prior to such adjustment and the denominator shall
be the Exercise Price resulting from such adjustment;
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(d) | if and whenever at any time during the Adjustment Period, there is a reclassification of the Common Shares or
a capital reorganization of the Corporation other than as described in Section 4.1(a) or a consolidation, amalgamation, arrangement or merger of the Corporation with or into any other body corporate, trust, partnership or other entity (other
than consolidations, amalgamations, arrangements or mergers which do not result in any reclassification of the outstanding Common Shares or a change of the Common Shares into other shares), or a sale or conveyance of the property and assets of the
Corporation as an entirety or substantially as an entirety to any other body corporate, trust, partnership or other entity, any Registered Warrantholder who has not exercised its
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 26 -



| | right of acquisition prior to the effective date of such reclassification, capital reorganization,
consolidation, amalgamation, arrangement or merger, sale or conveyance, upon the exercise of such right thereafter, shall be entitled to receive upon payment of the Exercise Price and shall accept, in lieu of the number of Common Shares that prior
to such effective date the Registered Warrantholder would have been entitled to receive, the number of shares or other securities or property of the Corporation or of the body corporate, trust, partnership or other entity resulting from such merger,
amalgamation or consolidation, or to which such sale or conveyance may be made, as the case may be, that such Registered Warrantholder would have been entitled to receive on such reclassification, capital reorganization, consolidation, amalgamation,
arrangement or merger, sale or conveyance, if, on the effective date thereof, as the case may be, the Registered Warrantholder had been the registered holder of the number of Common Shares to which prior to such effective date it was entitled to
acquire upon the exercise of the Warrants. If determined appropriate by the Warrant Agent, relying on advice of Counsel, to give effect to or to evidence the provisions of this Section 4.1(d), the Corporation, its successor, or such purchasing
body corporate, partnership, trust or other entity, as the case may be, shall, prior to or contemporaneously with any such reclassification, capital reorganization, consolidation, amalgamation, arrangement, merger, sale or conveyance, enter into an
indenture which shall provide, to the extent possible, for the application of the provisions set forth in this Indenture with respect to the rights and interests thereafter of the Registered Warrantholders to the end that the provisions set forth in
this Indenture shall thereafter correspondingly be made applicable, as nearly as may reasonably be, with respect to any shares, other securities or property to which a Registered Warrantholder is entitled on the exercise of its acquisition rights
thereafter. Any indenture entered into between the Corporation and the Warrant Agent pursuant to the provisions of this Section 4.1(d) shall be a supplemental indenture entered into pursuant to the provisions of Article 8 hereof. Any
indenture entered into between the Corporation, any successor to the Corporation or such purchasing body corporate, partnership, trust or other entity and the Warrant Agent shall provide for adjustments which shall be as nearly equivalent as may be
practicable to the adjustments provided in this Section 4.1 and which shall apply to successive reclassifications, capital reorganizations, amalgamations, consolidations, mergers, sales or conveyances;
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(e) | in any case in which this Section 4.1 shall require that an adjustment shall become effective immediately
after a record date for an event referred to herein, the Corporation may defer, until the occurrence of such event, issuing to the Registered Warrantholder of any Warrant exercised after the record date and prior to the completion of such event the
additional Common Shares issuable by reason of the adjustment required by such event before giving effect to such adjustment; provided, however, that the Corporation shall deliver to such Registered Warrantholder an appropriate instrument evidencing
such Registered Warrantholders right to receive such additional Common Shares upon the occurrence of the event requiring such adjustment and the right to receive any distributions made on such additional Common Shares declared in favour of
holders of record of Common Shares on and after the relevant date of exercise or such later date as such Registered Warrantholder would, but for the provisions of this Section 4.1(e), have become the holder of record of such additional Common
Shares pursuant to Section 4.1;
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 27 -



|(f) | in any case in which Section 4.1(a)(iii), Section 4.1(b) or Section 4.1(c) require that an
adjustment be made to the Exercise Price, no such adjustment shall be made if the Registered Warrantholders of the outstanding Warrants receive, subject to any required stock exchange or regulatory approval, the rights or warrants referred to in
Section 4.1(a)(iii), Section 4.1(b) or the shares, rights, options, warrants, evidences of indebtedness or assets referred to in Section 4.1(c), as the case may be, in such kind and number as they would have received if they had been
holders of Common Shares on the applicable record date or effective date, as the case may be, by virtue of their outstanding Warrant having then been exercised into Common Shares at the Exercise Price in effect on the applicable record date or
effective date, as the case may be;
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(g) | the adjustments provided for in this Section 4.1 are cumulative, and shall, in the case of adjustments to
the Exercise Price be computed to the nearest whole cent and shall apply to successive subdivisions, re-divisions, reductions, combinations, consolidations, distributions, issues or other events resulting in any adjustment under the provisions of
this Section 4.1, provided that, notwithstanding any other provision of this Section, no adjustment of the Exercise Price shall be required unless such adjustment would require an increase or decrease of at least 1% in the Exercise Price then
in effect; provided, however, that any adjustments which by reason of this Section 4.1(g) are not required to be made shall be carried forward and taken into account in any subsequent adjustment; and
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(h) | after any adjustment pursuant to this Section 4.1, the term Common Shares where used
in this Indenture shall be interpreted to mean securities of any class or classes which, as a result of such adjustment and all prior adjustments pursuant to this Section 4.1, the Registered Warrantholder is entitled to receive upon the
exercise of his Warrants, and the number of Common Shares indicated by any exercise made pursuant to a Warrant shall be interpreted to mean the number of Common Shares or other property or securities a Registered Warrantholder is entitled to
receive, as a result of such adjustment and all prior adjustments pursuant to this Section 4.1, upon the full exercise of a Warrant.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4.2 | Entitlement to Common Shares on Exercise of Warrant.
|--- | ----------------------------------------------------

All Common Shares or shares of any class or other securities, which a Registered Warrantholder is at the time in question
entitled to receive on the exercise of its Warrant, whether or not as a result of adjustments made pursuant to this Article 4, shall, for the purposes of the interpretation of this Indenture, be deemed to be Common Shares which such Registered
Warrantholder is entitled to acquire pursuant to such Warrant.



|4.3 | No Adjustment for Certain Transactions.
|--- | ---------------------------------------

Notwithstanding anything in this Article 4, no adjustment shall be made in the acquisition rights attached to the
Warrants if the issue of Common Shares is being made pursuant to this Indenture or in connection with (a) any share incentive plan or restricted share plan or share purchase plan in force from time to time for directors, officers, employees,
consultants or other service providers of the Corporation; or (b) the satisfaction of existing instruments issued at the date hereof.



---



- 28 -



|4.4 | Determination by Independent Firm.
|--- | ----------------------------------

In the event of any question arising with respect to the adjustments provided for in this Article 4 such question shall
be conclusively determined by an independent firm of chartered accountants other than the Auditors, who shall have access to all necessary records of the Corporation, and such determination shall be binding upon the Corporation, the Warrant Agent,
all holders and all other persons interested therein.



|4.5 | Proceedings Prior to any Action Requiring Adjustment.
|--- | -----------------------------------------------------

As a condition precedent to the taking of any action which would require an adjustment in any of the acquisition rights
pursuant to any of the Warrants, including the number of Common Shares which are to be received upon the exercise thereof, the Corporation shall take any action which may, in the opinion of Counsel, be necessary in order that the Corporation has
unissued and reserved in its authorized capital and may validly and legally issue as fully paid and non-assessable all the Common Shares which the holders of such Warrants are entitled to receive on the full exercise thereof in accordance with the
provisions hereof.



|4.6 | Certificate of Adjustment.
|--- | --------------------------

The Corporation shall from time to time immediately after the occurrence of any event which requires an adjustment or
readjustment as provided in Section 4.1, deliver a certificate of the Corporation to the Warrant Agent specifying the nature of the event requiring the same and the amount of the adjustment or readjustment necessitated thereby and setting forth
in reasonable detail the method of calculation and the facts upon which such calculation is based, which certificate shall be supported by a certificate of the Corporations Auditors verifying such calculation. The Warrant Agent shall rely, and
shall be protected in so doing, upon the certificate of the Corporation or of the Corporations Auditor and any other document filed by the Corporation pursuant to this Article 4 for all purposes.



|4.7 | Notice of Special Matters.
|--- | --------------------------

The Corporation covenants with the Warrant Agent that, so long as any Warrant remains outstanding, it will give notice to the
Warrant Agent and to the Registered Warrantholders of its intention to fix a record date that is prior to the Expiry Date for any matter for which an adjustment may be required pursuant to Section 4.1. Such notice shall specify the particulars
of such event and the record date for such event, provided that the Corporation shall only be required to specify in the notice such particulars of the event as shall have been fixed and determined on the date on which the notice is given. The
notice shall be given in each case not less than 14 days prior to such applicable record date. If notice has been given and the adjustment is not then determinable, the Corporation shall promptly, after the adjustment is determinable, file with the
Warrant Agent a computation of the adjustment and give notice to the Registered Warrantholders of such adjustment computation.



|4.8 | No Action after Notice.
|--- | -----------------------

The Corporation covenants with the Warrant Agent that it will not close its transfer books or take any other corporate action
which might deprive the Registered Warrantholder of the



---



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opportunity to exercise its right of acquisition pursuant thereto during the period of 14 days
after the giving of the certificate or notices set forth in Section 4.6 and Section 4.7.



|4.9 | Other Action.
|--- | -------------

If the Corporation, after the date hereof, shall take any action affecting the Common Shares other than action described in
Section 4.1, which in the reasonable opinion of the directors of the Corporation would materially affect the rights of Registered Warrantholders, the Exercise Price and/or Exchange Rate, the number of Common Shares which may be acquired upon
exercise of the Warrants shall be adjusted in such manner and at such time, by action of the directors, acting reasonably and in good faith, in their sole discretion as they may determine to be equitable to the Registered Warrantholders in the
circumstances, provided that no such adjustment will be made unless any requisite prior approval of any stock exchange on which the Common Shares are listed for trading has been obtained.



|4.10 | Protection of Warrant Agent.
|---- | ----------------------------

The Warrant Agent shall not:



| | (i) | at any time be under any duty or responsibility to any Registered Warrantholder to determine whether any facts
exist which may require any adjustment contemplated by Section 4.1, or with respect to the nature or extent of any such adjustment when made, or with respect to the method employed in making the same;
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | be accountable with respect to the validity or value (or the kind or amount) of any Common Shares or of any
other securities or property which may at any time be issued or delivered upon the exercise of the rights attaching to any Warrant;
| | ---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iii) | be responsible for any failure of the Corporation to issue, transfer or deliver Common Shares or certificates
for the same upon the surrender of any Warrants for the purpose of the exercise of such rights or to comply with any of the covenants contained in this Article 4; and
| | ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iv) | incur any liability or be in any way responsible for the consequences of any breach on the part of the
Corporation of any of the representations, warranties or covenants herein contained or of any acts of the directors, officers, employees, agents or servants of the Corporation.
| | ---- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|4.11 | Participation by Warrantholder.
|---- | -------------------------------

No adjustments shall be made pursuant to this Article 4 if the Registered Warrantholders are entitled to participate in
any event described in this Article 4 on the same terms, mutatis mutandis, as if the Registered Warrantholders had exercised their Warrants prior to, or on the effective date or record date of, such event.



---



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ARTICLE 5

RIGHTS OF THE CORPORATION AND COVENANTS



|5.1 | Optional Purchases by the Corporation.
|--- | --------------------------------------

Subject to compliance with Applicable Securities Laws and approval of applicable regulatory authorities and any stock exchange
on which the Common Shares are listed, the Corporation may from time to time purchase by private contract or otherwise any of the Warrants. Any such purchase shall be made at the lowest price or prices at which, in the opinion of the directors, such
Warrants are then obtainable, plus reasonable costs of purchase, and may be made in such manner, from such persons and on such other terms as the Corporation, in its sole discretion, may determine. In the case of Certificated Warrants, Warrant
Certificates representing the Warrants purchased pursuant to this Section 5.1 shall forthwith be delivered to and cancelled by the Warrant Agent and reflected accordingly on the register of Warrants. In the case of Uncertificated Warrants, the
Warrants purchased pursuant to this Section 5.1 shall be reflected accordingly on the register of Warrants and in accordance with procedures prescribed by the Depository under the Book Based System. No Warrants shall be issued in replacement
thereof.



|5.2 | General Covenants.
|--- | ------------------

The Corporation covenants with the Warrant Agent that so long as any Warrants remain outstanding:



|(a) | it will reserve and keep available a sufficient number of Common Shares for the purpose of enabling it to
satisfy its obligations to issue Common Shares upon the exercise of the Warrants;
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | it will cause the Common Shares from time to time acquired pursuant to the exercise of the Warrants to be duly
issued and delivered in accordance with the Warrants and the terms hereof;
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | all Common Shares which shall be issued upon exercise of the right to acquire provided for herein shall be
fully paid and non-assessable;
|--- | -----------------------------------------------------------------------------------------------------------------------------------------



|(d) | it will use reasonable commercial efforts to maintain its corporate existence and carry on its business in the
ordinary course;
|--- | -------------------------------------------------------------------------------------------------------------------------------



|(a) | it will use reasonable commercial efforts to ensure that all Common Shares outstanding or issuable from time
to time (including without limitation the Common Shares issuable on the exercise of the Warrants) continue to be or are listed and posted for trading on the TSXV (or such other Canadian stock exchange acceptable to the Corporation) and NASDAQ,
provided that this clause shall not be construed as limiting or restricting the Corporation from completing a consolidation, amalgamation, arrangement takeover bid or merger that would result in the Common Shares ceasing to be listed and posted for
trading on the TSXV or NASDAQ, so long as the holders of Common Shares receive securities of an entity which is listed on a stock exchange in Canada or the United States, or cash, or the holders of the Common Shares have approved the transaction in
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 31 -



| | accordance with the requirements of applicable corporate and securities laws and the policies of the TSXV and,
to the extent applicable, NASDAQ;
| | ------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | it will make all requisite filings under applicable Canadian securities legislation including those necessary
to remain a reporting issuer not in default in each of the provinces and other Canadian jurisdictions where it is or becomes a reporting issuer; and
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | generally, it will well and truly perform and carry out all of the acts or things to be done by it as provided
in this Indenture.
|--- | ---------------------------------------------------------------------------------------------------------------------------------



|5.3 | Warrant Agents Remuneration and Expenses.
|--- | ------------------------------------------

The Corporation covenants that it will pay to the Warrant Agent from time to time reasonable remuneration for its services
hereunder and will pay or reimburse the Warrant Agent upon its request for all reasonable expenses, disbursements and advances incurred or made by the Warrant Agent in the administration or execution of the trusts hereby created (including the
reasonable compensation and the disbursements of its Counsel and all other advisers and assistants not regularly in its employ) both before any default hereunder and thereafter until all duties of the Warrant Agent hereunder shall be finally and
fully performed. Any amount owing hereunder and remaining unpaid after 30 days from the invoice date will bear interest at the then current rate charged by the Warrant Agent against unpaid invoices and shall be payable upon demand. This
Section shall survive the resignation of the Warrant Agent and/ or the termination of this Indenture.



|5.4 | Performance of Covenants by Warrant Agent.
|--- | ------------------------------------------

If the Corporation shall fail to perform any of its covenants contained in this Indenture, the Warrant Agent may notify the
Registered Warrantholders of such failure on the part of the Corporation or may itself perform any of the covenants capable of being performed by it but, subject to Section 9.2, shall be under no obligation to perform said covenants or to
notify the Registered Warrantholders of such performance by it. All sums expended or advanced by the Warrant Agent in so doing shall be repayable as provided in Section 5.3. No such performance, expenditure or advance by the Warrant Agent shall
relieve the Corporation of any default hereunder or of its continuing obligations under the covenants herein contained.



|5.5 | Enforceability of Warrants.
|--- | ---------------------------

The Corporation covenants and agrees that it is duly authorized to create and issue the Warrants to be issued hereunder and
that the Warrants, when issued and Authenticated as herein provided, will be valid and enforceable against the Corporation in accordance with the provisions hereof and the terms hereof and that, subject to the provisions of this Indenture, the
Corporation will cause the Common Shares from time to time acquired upon exercise of Warrants issued under this Indenture to be duly issued and delivered in accordance with the terms of this Indenture.



---



- 32 -



ARTICLE 6

ENFORCEMENT



|6.1 | Suits by Registered Warrantholders.
|--- | -----------------------------------

All or any of the rights conferred upon any Registered Warrantholder by any of the terms of this Indenture may be enforced by
the Registered Warrantholder by appropriate proceedings but without prejudice to the right which is hereby conferred upon the Warrant Agent to proceed in its own name to enforce each and all of the provisions herein contained for the benefit of the
Registered Warrantholders.



|6.2 | Suits by the Corporation.
|--- | -------------------------

The Corporation shall have the right to enforce full payment of the Exercise Price of all Common Shares issued by the Warrant
Agent to a Registered Warrantholder hereunder and shall be entitled to demand such payment from the Registered Warrantholder or alternatively to instruct the Warrant Agent to cancel the share certificates and amend the securities register
accordingly.



|6.3 | Immunity of Shareholders, etc.
|--- | ------------------------------

The Warrant Agent and the Warrantholders hereby waive and release any right, cause of action or remedy now or hereafter
existing in any jurisdiction against any incorporator or any past, present or future shareholder, trustee, employee or agent of the Corporation or any successor entity on any covenant, agreement, representation or warranty by the Corporation herein.



|6.4 | Waiver of Default.
|--- | ------------------

Upon the happening of any default hereunder:



| | (i) | the Registered Warrantholders of not less than 51% of the Warrants then outstanding shall have power (in
addition to the powers exercisable by Extraordinary Resolution) by requisition in writing to instruct the Warrant Agent to waive any default hereunder and the Warrant Agent shall thereupon waive the default upon such terms and conditions as shall be
prescribed in such requisition; or
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | the Warrant Agent shall have power to waive any default hereunder upon such terms and conditions as the
Warrant Agent may deem advisable, on the advice of Counsel, if, in the Warrant Agents opinion, based on the advice of Counsel, the same shall have been cured or adequate provision made therefor;
| | ---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

provided that no delay or omission of the Warrant Agent or of the Registered Warrantholders to exercise any right or power accruing upon any
default shall impair any such right or power or shall be construed to be a waiver of any such default or acquiescence therein and provided further that no act or omission either of the Warrant Agent or of the Registered Warrantholders in the
premises shall extend to or be taken in any manner whatsoever to affect any subsequent default hereunder of the rights resulting therefrom.



---



- 33 -



ARTICLE 7

MEETINGS OF REGISTERED WARRANTHOLDERS



|7.1 | Right to Convene Meetings.
|--- | --------------------------

The Warrant Agent may at any time and from time to time, and shall on receipt of a written request of the Corporation or of a
Warrantholders Request and upon being indemnified and funded to its reasonable satisfaction by the Corporation or by the Registered Warrantholders signing such Warrantholders Request against the costs which may be incurred in connection
with the calling and holding of such meeting, convene a meeting of the Registered Warrantholders. If the Warrant Agent fails to so call a meeting within seven days after receipt of such written request of the Corporation or such Warrantholders
Request and the indemnity and funding given as aforesaid, the Corporation or such Registered Warrantholders, as the case may be, may convene such meeting. Every such meeting shall be held in the City of Montreal, Québec or at such other place
as may be approved or determined by the Warrant Agent.



|7.2 | Notice.
|--- | -------

At least 21 days prior written notice of any meeting of Registered Warrantholders shall be given to the Registered
Warrantholders in the manner provided for in Section 10.2 and a copy of such notice shall be sent by mail to the Warrant Agent (unless the meeting has been called by the Warrant Agent) and to the Corporation (unless the meeting has been called
by the Corporation). Such notice shall state the time when and the place where the meeting is to be held, shall state briefly the general nature of the business to be transacted thereat and shall contain such information as is reasonably necessary
to enable the Registered Warrantholders to make a reasoned decision on the matter, but it shall not be necessary for any such notice to set out the terms of any resolution to be proposed or any of the provisions of this Section 7.2.



|7.3 | Chairman.
|--- | ---------

An individual (who need not be a Registered Warrantholder) designated in writing by the Warrant Agent shall be chairman of the
meeting and if no individual is so designated, or if the individual so designated is not present within fifteen minutes from the time fixed for the holding of the meeting, the Registered Warrantholders present in person or by proxy shall choose an
individual present to be chairman.



|7.4 | Quorum.
|--- | -------

Subject to the provisions of Section 7.11, at any meeting of the Registered Warrantholders a quorum shall consist of
Registered Warrantholder(s) present in person or by proxy and entitled to purchase at least 20% of the aggregate number of Common Shares which could be acquired pursuant to all the then-outstanding Warrants. If a quorum of the Registered
Warrantholders shall not be present within thirty minutes from the time fixed for holding any meeting, the meeting, if summoned by Registered Warrantholders or on a Warrantholders Request, shall be dissolved; but in any other case the meeting
shall be adjourned to the same day in the next week (unless such day is not a Business Day, in which case it shall be adjourned to the next following Business Day) at the same time and place and no notice of the adjournment need be given. Any
business may be brought before or dealt with at an adjourned meeting which might have been dealt with at the original meeting in accordance with the notice calling the



---



- 34 -



same. No business shall be transacted at any meeting unless a quorum be present at the
commencement of business. At the adjourned meeting the Registered Warrantholders present in person or by proxy shall form a quorum and may transact the business for which the meeting was originally convened, notwithstanding that they may not be
entitled to acquire at least 20% of the aggregate number of Common Shares which may be acquired pursuant to all then outstanding Warrants.



|7.5 | Power to Adjourn.
|--- | -----------------

The chairman of any meeting at which a quorum of the Registered Warrantholders is present may, with the consent of the
meeting, adjourn any such meeting, and no notice of such adjournment need be given except such notice, if any, as the meeting may prescribe.



|7.6 | Show of Hands.
|--- | --------------

Every question submitted to a meeting shall be decided in the first place by a majority of the votes given on a show of hands
except that votes on an Extraordinary Resolution shall be given in the manner hereinafter provided. At any such meeting, unless a poll is duly demanded as herein provided, a declaration by the chairman that a resolution has been carried or carried
unanimously or by a particular majority or lost or not carried by a particular majority shall be conclusive evidence of the fact.



|7.7 | Poll and Voting.
|--- | ----------------



|(a) | On every Extraordinary Resolution, and on any other question submitted to a meeting and after a vote by show
of hands when demanded by the chairman or by one or more of the Registered Warrantholders acting in person or by proxy and entitled to acquire in the aggregate at least 5% of the aggregate number of Common Shares which could be acquired pursuant to
all the Warrants then outstanding, a poll shall be taken in such manner as the chairman shall direct. Questions other than those required to be determined by Extraordinary Resolution shall be decided by a majority of the votes cast on the poll.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | On a show of hands, every person who is present and entitled to vote, whether as a Registered Warrantholder or
as proxy for one or more absent Registered Warrantholders, or both, shall have one vote. On a poll, each Registered Warrantholder present in person or represented by a proxy duly appointed by instrument in writing shall be entitled to one vote in
respect of each Warrant then held or represented by it. A proxy need not be a Registered Warrantholder. The chairman of any meeting shall be entitled, both on a show of hands and on a poll, to vote in respect of the Warrants, if any, held or
represented by him.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|7.8 | Regulations.
|--- | ------------



|(a) | The Warrant Agent, or the Corporation with the approval of the Warrant Agent, may from time to time make and
from time to time vary such regulations as it shall think fit for the setting of the record date for a meeting for the purpose of determining Registered Warrantholders entitled to receive notice of and to vote at the meeting.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 35 -



|(b) | Any regulations so made shall be binding and effective and the votes given in accordance therewith shall be
valid and shall be counted. Save as such regulations may provide, the only persons who shall be recognized at any meeting as a Registered Warrantholder, or be entitled to vote or be present at the meeting in respect thereof (subject to
Section 7.9), shall be Registered Warrantholders or proxies of Registered Warrantholders.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|7.9 | Corporation and Warrant Agent May be Represented.
|--- | -------------------------------------------------

The Corporation and the Warrant Agent, by their respective directors, officers, agents, and employees and the Counsel for the
Corporation and for the Warrant Agent may attend any meeting of the Registered Warrantholders.



|7.10 | Powers Exercisable by Extraordinary Resolution.
|---- | -----------------------------------------------

In addition to all other powers conferred upon them by any other provisions of this Indenture or by law, the Registered
Warrantholders at a meeting shall, subject to the provisions of Section 7.11, have the power exercisable from time to time by Extraordinary Resolution:



| | (i) | to agree to any modification, abrogation, alteration, compromise or arrangement of the rights of Registered
Warrantholders or the Warrant Agent in its capacity as warrant agent hereunder (subject to the Warrant Agents prior consent, acting reasonably) or on behalf of the Registered Warrantholders against the Corporation whether such rights arise
under this Indenture or otherwise;
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | to amend, alter or repeal any Extraordinary Resolution previously passed or sanctioned by the Registered
Warrantholders;
| | ---- | ------------------------------------------------------------------------------------------------------------------------



| | (iii) | to direct or to authorize the Warrant Agent, subject to Section 9.2(a) hereof, to enforce any of the
covenants on the part of the Corporation contained in this Indenture or to enforce any of the rights of the Registered Warrantholders in any manner specified in such Extraordinary Resolution or to refrain from enforcing any such covenant or right;
| | ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iv) | to waive, and to direct the Warrant Agent to waive, any default on the part of the Corporation in complying
with any provisions of this Indenture either unconditionally or upon any conditions specified in such Extraordinary Resolution;
| | ---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (v) | to restrain any Registered Warrantholder from taking or instituting any suit, action or proceeding against the
Corporation for the enforcement of any of the covenants on the part of the Corporation in this Indenture or to enforce any of the rights of the Registered Warrantholders;
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (vi) | to direct any Registered Warrantholder who, as such, has brought any suit, action or proceeding to stay or to
discontinue or otherwise to deal with the same upon payment of the costs, charges and expenses reasonably and properly incurred by such Registered Warrantholder in connection therewith;
| | ---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 36 -



| | (vii) | to assent to any change in or omission from the provisions contained in this Indenture or any ancillary or
supplemental instrument which may be agreed to by the Corporation, and to authorize the Warrant Agent to concur in and execute any ancillary or supplemental indenture embodying the change or omission;
| | ----- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (viii) | with the consent of the Corporation, such consent not to be unreasonably withheld, to remove the Warrant Agent
or its successor in office and to appoint a new warrant agent or warrant agents to take the place of the Warrant Agent so removed; and
| | ------ | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ix) | to assent to any compromise or arrangement with any creditor or creditors or any class or classes of
creditors, whether secured or otherwise, and with holders of any shares or other securities of the Corporation.
| | ---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|7.11 | Meaning of Extraordinary Resolution.
|---- | ------------------------------------



|(a) | The expression Extraordinary Resolution when used in this Indenture means, subject as
hereinafter provided in this Section 7.11 and in Section 7.14, a resolution proposed at a meeting of Registered Warrantholders duly convened for that purpose and held in accordance with the provisions of this Article 7 at which there
are present in person or by proxy Registered Warrantholders holding at least 20% of the aggregate number of Common Shares that could be acquired and passed by the affirmative votes of Registered Warrantholders holding not less than 662⁄3% of the aggregate number of Common Shares that could be acquired at the meeting and voted on the poll upon such resolution.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | If, at the meeting at which an Extraordinary Resolution is to be considered, Registered Warrantholders holding
at least 20% of the aggregate number of Common Shares that could be acquired are not present in person or by proxy within 30 minutes after the time appointed for the meeting, then the meeting, if convened by Registered Warrantholders or on a
Warrantholders Request, shall be dissolved; but in any other case it shall stand adjourned to such day, being not less than 15 or more than 60 days later, and to such place and time as may be appointed by the chairman. Not less than 14
days prior notice shall be given of the time and place of such adjourned meeting in the manner provided for in Section 10.2. Such notice shall state that at the adjourned meeting the Registered Warrantholders present in person or by proxy
shall form a quorum but it shall not be necessary to set forth the purposes for which the meeting was originally called or any other particulars. At the adjourned meeting the Registered Warrantholders present in person or by proxy shall form a
quorum and may transact the business for which the meeting was originally convened and a resolution proposed at such adjourned meeting and passed by the requisite vote as provided in Section 7.11(a) shall be an Extraordinary Resolution within
the meaning of this Indenture notwithstanding that Registered Warrantholders entitled to acquire at least 20% of the aggregate number of Common Shares which may be acquired pursuant to all the then outstanding Warrants are not present in person or
by proxy at such adjourned meeting.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Subject to Section 7.14, votes on an Extraordinary Resolution shall always be given on a poll and no
demand for a poll on an Extraordinary Resolution shall be necessary.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 37 -



|7.12 | Powers Cumulative.
|---- | ------------------

Any one or more of the powers or any combination of the powers in this Indenture stated to be exercisable by the Registered
Warrantholders by Extraordinary Resolution or otherwise may be exercised from time to time and the exercise of any one or more of such powers or any combination of powers from time to time shall not be deemed to exhaust the right of the Registered
Warrantholders to exercise such power or powers or combination of powers then or thereafter from time to time.



|7.13 | Minutes.
|---- | --------

Minutes of all resolutions and proceedings at every meeting of Registered Warrantholders shall be made and duly entered in
books to be provided from time to time for that purpose by the Warrant Agent at the expense of the Corporation, and any such minutes as aforesaid, if signed by the chairman or the secretary of the meeting at which such resolutions were passed or
proceedings had shall be prima facie evidence of the matters therein stated and, until the contrary is proved, every such meeting in respect of the proceedings of which minutes shall have been made shall be deemed to have been duly convened and
held, and all resolutions passed thereat or proceedings taken shall be deemed to have been duly passed and taken.



|7.14 | Instruments in Writing.
|---- | -----------------------

All actions which may be taken and all powers that may be exercised by the Registered Warrantholders at a meeting held as
provided in this Article 7 may also be taken and exercised by Registered Warrantholders holding at least 662⁄3% of the aggregate number of all of the
then outstanding Warrants by an instrument in writing signed in one or more counterparts by such Registered Warrantholders in person or by attorney duly appointed in writing, and the expression Extraordinary Resolution when used
in this Indenture shall include an instrument so signed.



|7.15 | Binding Effect of Resolutions.
|---- | ------------------------------

Every resolution and every Extraordinary Resolution passed in accordance with the provisions of this Article 7 at a
meeting of Registered Warrantholders shall be binding upon all the Warrantholders, whether present at or absent from such meeting, and every instrument in writing signed by Registered Warrantholders in accordance with Section 7.14 shall be
binding upon all the Warrantholders, whether signatories thereto or not, and each and every Warrantholder and the Warrant Agent (subject to the provisions for indemnity herein contained) shall be bound to give effect accordingly to every such
resolution and instrument in writing.



|7.16 | Holdings by Corporation Disregarded.
|---- | ------------------------------------

In determining whether Registered Warrantholders holding Warrants evidencing the entitlement to acquire the required number of
Common Shares are present at a meeting of Registered Warrantholders for the purpose of determining a quorum or have concurred in any consent, waiver, Extraordinary Resolution, Warrantholders Request or other action under this Indenture,
Warrants owned legally or beneficially by the Corporation shall be disregarded in accordance with the provisions of Section 10.7.



---



- 38 -



ARTICLE 8

SUPPLEMENTAL INDENTURES



|8.1 | Provision for Supplemental Indentures for Certain Purposes.
|--- | -----------------------------------------------------------

From time to time, the Corporation (when authorized by action of the directors) and the Warrant Agent may, subject to the
provisions hereof and they shall, when so directed in accordance with the provisions hereof, execute and deliver by their proper officers, indentures or instruments supplemental hereto, which thereafter shall form part hereof, for any one or more or
all of the following purposes:



| | (i) | setting forth any adjustments resulting from the application of the provisions of Article 4;
| | --- | --------------------------------------------------------------------------------------------



| | (ii) | adding to the provisions hereof such additional covenants and enforcement provisions as, in the opinion of
Counsel, are necessary or advisable in the premises, provided that the same are not in the opinion of the Warrant Agent, relying on the advice of Counsel, prejudicial to the interests of the Registered Warrantholders;
| | ---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iii) | giving effect to any Extraordinary Resolution passed as provided in Section 7.11;
| | ----- | ---------------------------------------------------------------------------------



| | (iv) | making such provisions not inconsistent with this Indenture as may be necessary or desirable with respect to
matters or questions arising hereunder or for the purpose of obtaining a listing or quotation of the Warrants on any stock exchange, provided that such provisions are not, in the opinion of the Warrant Agent, relying on the advice of Counsel,
prejudicial to the interests of the Registered Warrantholders;
| | ---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (v) | adding to or altering the provisions hereof in respect of the transfer of Warrants, making provision for the
exchange of Warrants, and making any modification in the form of the Warrant Certificates which does not affect the substance thereof;
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (vi) | modifying any of the provisions of this Indenture, including relieving the Corporation from any of the
obligations, conditions or restrictions herein contained, provided that such modification or relief shall be or become operative or effective only if, in the opinion of the Warrant Agent, relying on the advice of Counsel, such modification or relief
in no way prejudices any of the rights of the Registered Warrantholders or of the Warrant Agent, and provided further that the Warrant Agent may in its sole discretion decline to enter into any such supplemental indenture which in its opinion may
not afford adequate protection to the Warrant Agent when the same shall become operative;
| | ---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (vii) | providing for the issuance of additional Warrants hereunder, including Warrants in excess of the number set
out in Section 2.1 and any consequential amendments hereto as may be required by the Warrant Agent relying on the advice of Counsel; and
| | ----- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 39 -



| | (viii) | for any other purpose not inconsistent with the terms of this Indenture, including the correction or
rectification of any ambiguities, defective or inconsistent provisions, errors, mistakes or omissions herein, provided that in the opinion of the Warrant Agent, relying on the advice of Counsel, the rights of the Warrant Agent and of the Registered
Warrantholders are in no way prejudiced thereby.
| | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|8.2 | Successor Entities.
|--- | -------------------

In the case of the consolidation, amalgamation, arrangement, merger or transfer of the undertaking or assets of the
Corporation as an entirety or substantially as an entirety to or with another entity (successor entity), the successor entity resulting from such consolidation, amalgamation, arrangement, merger or transfer (if not the
Corporation) shall expressly assume, by supplemental indenture satisfactory in form to the Warrant Agent and executed and delivered to the Warrant Agent, the due and punctual performance and observance of each and every covenant and condition of
this Indenture to be performed and observed by the Corporation.

ARTICLE 9

CONCERNING THE WARRANT AGENT



|9.1 | Trust Indenture Legislation.
|--- | ----------------------------



|(a) | If and to the extent that any provision of this Indenture limits, qualifies or conflicts with a mandatory
requirement of Applicable Legislation, such mandatory requirement shall prevail.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | The Corporation and the Warrant Agent agree that each will, at all times in relation to this Indenture and any
action to be taken hereunder, observe and comply with and be entitled to the benefits of Applicable Legislation.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|9.2 | Rights and Duties of Warrant Agent.
|--- | -----------------------------------



|(a) | In the exercise of the rights and duties prescribed or conferred by the terms of this Indenture, the Warrant
Agent shall exercise that degree of care, diligence and skill that a reasonably prudent warrant agent would exercise in comparable circumstances. No provision of this Indenture shall be construed to relieve the Warrant Agent from liability for its
own gross negligent action, wilful misconduct, bad faith or fraud under this Indenture.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | The obligation of the Warrant Agent to commence or continue any act, action or proceeding for the purpose of
enforcing any rights of the Warrant Agent or the Registered Warrantholders hereunder shall be conditional upon the Registered Warrantholders furnishing, when required by notice by the Warrant Agent, sufficient funds to commence or to continue such
act, action or proceeding and an indemnity reasonably satisfactory to the Warrant Agent to protect and to hold harmless the Warrant Agent and its officers, directors, employees and agents, against the costs, charges and expenses and liabilities to
be incurred thereby and any loss and damage it may suffer by reason thereof. None of the provisions contained in this Indenture shall require the Warrant Agent to expend or to risk its own funds or otherwise to incur financial liability
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 40 -



| | in the performance of any of its duties or in the exercise of any of its rights or powers unless indemnified
and funded as aforesaid.
| | -------------------------------------------------------------------------------------------------------------------------------------



|(c) | The Warrant Agent may, before commencing or at any time during the continuance of any such act, action or
proceeding, require the Registered Warrantholders, at whose instance it is acting to deposit with the Warrant Agent the Warrants Certificates held by them, for which Warrants the Warrant Agent shall issue receipts.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(d) | Every provision of this Indenture that by its terms relieves the Warrant Agent of liability or entitles it to
rely upon any evidence submitted to it is subject to the provisions of Applicable Legislation.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|9.3 | Evidence, Experts and Advisers.
|--- | -------------------------------



|(a) | In addition to the reports, certificates, opinions and other evidence required by this Indenture, the
Corporation shall furnish to the Warrant Agent such additional evidence of compliance with any provision hereof, and in such form, as may be prescribed by Applicable Legislation or as the Warrant Agent may reasonably require by written notice to the
Corporation.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | In the exercise of its rights and duties hereunder, the Warrant Agent may, if it is acting in good faith, rely
as to the truth of the statements and the accuracy of the opinions expressed in statutory declarations, opinions, reports, written requests, consents, or orders of the Corporation, certificates of the Corporation or other evidence furnished to the
Warrant Agent pursuant to a request of the Warrant Agent, provided that such evidence complies with Applicable Legislation and that the Warrant Agent complies with Applicable Legislation and that the Warrant Agent examines the same and determines
that such evidence complies with the applicable requirements of this Indenture.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Whenever it is provided in this Indenture or under Applicable Legislation that the Corporation shall deposit
with the Warrant Agent resolutions, certificates, reports, opinions, requests, orders or other documents, it is intended that the truth, accuracy and good faith on the effective date thereof and the facts and opinions stated in all such documents so
deposited shall, in each and every such case, be conditions precedent to the right of the Corporation to have the Warrant Agent take the action to be based thereon.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(d) | The Warrant Agent may employ or retain such Counsel, accountants, appraisers or other experts or advisers as
it may reasonably require for the purpose of discharging its duties hereunder and may pay reasonable remuneration for all services so performed by any of them, without taxation of costs of any Counsel, and shall not be responsible for any misconduct
or negligence on the part of any such experts or advisers who have been appointed with due care by the Warrant Agent.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(e) | The Warrant Agent may act and rely and shall be protected in acting and relying in good faith on the opinion
or advice of or information obtained from any Counsel, accountant, appraiser, engineer or other expert or adviser, whether retained or employed by the
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 41 -



| | Corporation or by the Warrant Agent, in relation to any matter arising in the administration of the agency
hereof.
| | ------------------------------------------------------------------------------------------------------------------



|9.4 | Documents, Monies, etc. Held by Warrant Agent.
|--- | ----------------------------------------------



|(a) | Any monies, securities, documents of title or other instruments that may at any time be held by the Warrant
Agent shall be placed in the deposit vaults of the Warrant Agent or of any Canadian chartered bank listed in Schedule I of the Bank Act (Canada), or deposited for safekeeping with any such bank. Any monies held pending the application or withdrawal
thereof under any provisions of this Indenture, shall be held, invested and reinvested in Permitted Investments as directed in writing by the Corporation. Permitted Investments shall be treasury bills guaranteed by the Government of Canada having a
term to maturity not to exceed ninety (90) days, or term deposits or bankers acceptances of a Canadian chartered bank having a term to maturity not to exceed ninety (90) days, or such other investments that is in accordance with the
Warrant Agents standard type of investments. Unless otherwise specifically provided herein, all interest or other income received by the Warrant Agent in respect of such deposits and investments shall belong to the Corporation.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Any written direction for the investment or release of funds received shall be received by the Warrant Agent
by 9:00 a.m. (Montreal time) on the Business Day on which such investment or release is to be made, failing which such direction will be handled on a commercially reasonable efforts basis and may result in funds being invested or released on the
next Business Day.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | The Warrant Agent shall have no responsibility or liability for any diminution of any funds resulting from any
investment made in accordance with this Indenture, including any losses on any investment liquidated prior to maturity in order to make a payment required hereunder.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(d) | In the event that the Warrant Agent does not receive a direction or only a partial direction, the Warrant
Agent may hold cash balances constituting part or all of such monies and may, but need not, invest same in its deposit department, the deposit department of one of its affiliates, or the deposit department of a Canadian chartered bank; but the
Warrant Agent, its affiliates or a Canadian chartered bank shall not be liable to account for any profit to any parties to this Indenture or to any other person or entity.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|9.5 | Actions by Warrant Agent to Protect Interest.
|--- | ---------------------------------------------

The Warrant Agent shall have power to institute and to maintain such actions and proceedings as it may consider necessary or
expedient to preserve, protect or enforce its interests and the interests of the Registered Warrantholders.



|9.6 | Warrant Agent Not Required to Give Security.
|--- | --------------------------------------------

The Warrant Agent shall not be required to give any bond or security in respect of the execution of the agency and powers of
this Indenture or otherwise in respect of the premises.



---



- 42 -



|9.7 | Protection of Warrant Agent.
|--- | ----------------------------

By way of supplement to the provisions of any law for the time being relating to the Warrant Agent it is expressly declared
and agreed as follows:



| | (i) | the Warrant Agent shall not be liable for or by reason of any statements of fact or recitals in this Indenture
or in the Warrant Certificates (except the representation contained in Section 9.9 or in the authentication of the Warrant Agent on the Warrant Certificates) or be required to verify the same, but all such statements or recitals are and shall
be deemed to be made by the Corporation;
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | nothing herein contained shall impose any obligation on the Warrant Agent to see to or to require evidence of
the registration or filing (or renewal thereof) of this Indenture or any instrument ancillary or supplemental hereto;
| | ---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iii) | the Warrant Agent shall not be bound to give notice to any person or persons of the execution hereof;
| | ----- | -----------------------------------------------------------------------------------------------------



| | (iv) | the Warrant Agent shall not incur any liability or responsibility whatever or be in any way responsible for
the consequence of any breach on the part of the Corporation of any of its covenants herein contained or of any acts of any directors, officers, employees, agents or servants of the Corporation;
| | ---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (v) | the Corporation hereby indemnifies and agrees to hold harmless the Warrant Agent, its affiliates, their
officers, directors, employees, agents, successors and assigns from and against any and all liabilities, losses, damages, penalties, claims, actions, suits, costs, expenses and disbursements, including legal fees and disbursements of whatever kind
and nature which may at any time be imposed on or incurred by or asserted against the Warrant Agent, whether groundless or otherwise, arising from or out of any act, omission or error of the Warrant Agent, provided that the Corporation shall not be
required to indemnify the Warrant Agent in the event of the gross negligence or wilful misconduct of the Warrant Agent, and this provision shall survive the resignation or removal of the Warrant Agent or the termination or discharge of this
Indenture; and
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (vi) | notwithstanding the foregoing or any other provision of this Indenture, any liability of the Warrant Agent
shall be limited, in the aggregate, to the amount of annual retainer fees paid by the Corporation to the Warrant Agent under this Indenture in the twelve (12) months immediately prior to the Warrant Agent receiving the first notice of the
claim. Notwithstanding any other provision of this Indenture, and whether such losses or damages are foreseeable or unforeseeable, the Warrant Agent shall not be liable under any circumstances whatsoever for any: (a) breach by any other party
of Applicable Securities Laws; (b) lost profits; or (c) special, indirect, incidental, consequential, exemplary, aggravated or punitive losses or damages.
| | ---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 43 -



|9.8 | Replacement of Warrant Agent; Successor by Merger.
|--- | --------------------------------------------------



|(a) | The Warrant Agent may resign its agency and be discharged from all further duties and liabilities hereunder,
subject to this Section 9.8, by giving to the Corporation not less than 60 days prior notice in writing or such shorter prior notice as the Corporation may accept as sufficient. The Registered Warrantholders by Extraordinary Resolution
shall have power at any time to remove the existing Warrant Agent and to appoint a new warrant agent. In the event of the Warrant Agent resigning or being removed as aforesaid or being dissolved, becoming bankrupt, going into liquidation or
otherwise becoming incapable of acting hereunder, the Corporation shall forthwith appoint a new Warrant Agent unless a new Warrant Agent has already been appointed by the Registered Warrantholders; failing such appointment by the Corporation, the
retiring Warrant Agent or any Registered Warrantholder may apply to a judge of the Superior Court of the Province of Québec on such notice as such judge may direct, for the appointment of a new Warrant Agent; but any new Warrant Agent so
appointed by the Corporation or by the Court shall be subject to removal as aforesaid by the Registered Warrantholders. Any new Warrant Agent appointed under any provision of this Section 9.8 shall be an entity authorized to carry on the
business of a trust company in the Province of Québec and, if required by the Applicable Legislation for any other provinces, in such other provinces. On any such appointment the new warrant agent shall be vested with the same powers, rights,
duties and responsibilities as if it had been originally named herein as Warrant Agent hereunder.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | Upon the appointment of a successor warrant agent, the Corporation shall promptly notify the Registered
Warrantholders thereof in the manner provided for in Section 10.2.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | Any Warrant Authenticated but not delivered by a predecessor Warrant Agent may be Authenticated by the
successor Warrant Agent in the name of the predecessor or successor Warrant Agent.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(d) | Any corporation into which the Warrant Agent may be merged or consolidated or amalgamated, or any corporation
resulting therefrom to which the Warrant Agent shall be a party, or any corporation succeeding to substantially the corporate trust business of the Warrant Agent shall be the successor to the Warrant Agent hereunder without any further act on its
part or any of the parties hereto, provided that such corporation would be eligible for appointment as successor Warrant Agent under Section 9.8(a).
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|9.9 | Conflict of Interest.
|--- | ---------------------



|(a) | The Warrant Agent represents to the Corporation that to the best of its knowledge, at the time of execution
and delivery hereof no material conflict of interest exists between its role as a Warrant Agent hereunder and its role in any other capacity and agrees that in the event of a material conflict of interest arising hereafter it will, within 90 days
after ascertaining that it has such material conflict of interest, either eliminate the same or assign its agency hereunder to a successor Warrant Agent approved by the Corporation and meeting the requirements set forth in Section 9.8(a).
Notwithstanding the foregoing provisions of this Section 9.9(a), if any such material conflict of interest exists or hereafter shall exist, the validity and enforceability of this Indenture and the Warrant
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 44 -



| | Certificate, if applicable, shall not be affected in any manner whatsoever by reason thereof.
| | ---------------------------------------------------------------------------------------------



|(b) | Subject to Section 9.9(a), the Warrant Agent, in its personal or any other capacity, may buy, lend upon
and deal in securities of the Corporation and generally may contract and enter into financial transactions with the Corporation without being liable to account for any profit made thereby.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|9.10 | Acceptance of Agency.
|---- | ---------------------

The Warrant Agent hereby accepts the agency in this Indenture declared and provided for and agrees to perform the same upon
the terms and conditions herein set forth.



|9.11 | Warrant Agent Not to be Appointed Receiver.
|---- | -------------------------------------------

The Warrant Agent and any person related to the Warrant Agent shall not be appointed a receiver, a receiver and manager or
liquidator of all or any part of the assets or undertaking of the Corporation.



|9.12 | Warrant Agent Not Required to Give Notice of Default.
|---- | -----------------------------------------------------

The Warrant Agent shall not be bound to give any notice or do or take any act, action or proceeding by virtue of the powers
conferred on it hereby unless and until it shall have been required so to do under the terms hereof; nor shall the Warrant Agent be required to take notice of any default hereunder, unless and until notified in writing of such default, which notice
shall distinctly specify the default desired to be brought to the attention of the Warrant Agent and the Warrant Agent shall promptly provide the Warrantholders with any such notice and in the absence of any such notice the Warrant Agent may for all
purposes of this Indenture conclusively assume that no default has been made in the observance or performance of any of the representations, warranties, covenants, agreements or conditions contained herein. Any such notice shall in no way limit any
discretion herein given to the Warrant Agent to determine whether or not the Warrant Agent shall take action with respect to any default.



|9.13 | Anti-Money Laundering.
|---- | ----------------------



|(a) | Each party to this Agreement other than the Warrant Agent hereby represents to the Warrant Agent that any
account to be opened by, or interest to be held by the Warrant Agent in connection with this Agreement, for or to the credit of such party, either (i) is not intended to be used by or on behalf of any third party; or (ii) is intended to be
used by or on behalf of a third party, in which case such party hereto agrees to complete and execute forthwith a declaration in the Warrant Agents prescribed form as to the particulars of such third party.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | The Warrant Agent shall retain the right not to act and shall not be liable for refusing to act if, due to a
lack of information or for any other reason whatsoever, the Warrant Agent, in its sole judgment, determines that such act might cause it to be in non-compliance with any applicable anti-money laundering, anti-terrorist or economic sanctions
legislation, regulation or guideline. Further, should the Warrant Agent, in its sole judgment, determine at any time that its acting under this Indenture has resulted in
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 45 -



| | its being in non-compliance with any applicable anti-money laundering, anti-terrorist or economic sanctions
legislation, regulation or guideline, then it shall have the right to resign on 10 days written notice to the other parties to this Indenture, provided (i) that the Warrant Agents written notice shall describe the circumstances of such
non-compliance; (ii) that if such circumstances are rectified to the Warrant Agents satisfaction within such 10 day period, then such resignation shall not be effective.
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|9.14 | Compliance with Privacy Code.
|---- | -----------------------------

Each party to this Agreement acknowledges that the Warrant Agent may, in the course of providing services hereunder, collect
or receive financial and other personal information about such parties and/or their representatives, as individuals, or about other individuals related to the subject matter hereof, and use such information for the following purposes:



| | (i) | to provide the services required under this Indenture and other services that may be requested from time to
time;
| | --- | -----------------------------------------------------------------------------------------------------------------



| | (ii) | to help the Warrant Agent manage its servicing relationships with such individuals;
| | ---- | -----------------------------------------------------------------------------------



| | (iii) | to meet the Warrant Agents legal and regulatory requirements; and
| | ----- | ------------------------------------------------------------------



| | (iv) | if Social Insurance Numbers are collected by the Warrant Agent, to perform tax reporting and to assist in
verification of an individuals identity for security purposes.
| | ---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Each party to this Agreement
acknowledges and agrees that the Warrant Agent may receive, collect, use and disclose personal information provided to it or acquired by it in the course of its acting as agent hereunder for the purposes described above and, generally, in the manner
and on the terms described in its Privacy Code, which the Warrant Agent shall make available on its website or upon request, including revisions thereto. The Warrant Agent may transfer personal information to other companies in or outside of Canada
that provide data processing and storage or other support in order to facilitate the service it provides.

Further, the
Corporation agrees that it shall not provide or cause to be provided to the Warrant Agent any personal information relating to an individual who is not a party to this Indenture unless the Corporation has assured itself that such individual
understands and has consented to the aforementioned uses and disclosures.



|9.15 | Securities Exchange Commission Certification.
|---- | ---------------------------------------------

The Corporation confirms that it has either (i) a class of securities registered pursuant to Section 12 of the U.S.
Securities Exchange Act of 1934, as amended (the 1934 Act); or (ii) a reporting obligation pursuant to Section 15(d) of the Act, and has provided the Warrant Agent with an Officers Certificate (in a form provided
by the Warrant Agent) certifying such reporting obligation and other information as requested by the Warrant Agent. The Corporation covenants that in the event that any such registration or reporting obligation shall be terminated by the Corporation
in accordance with the 1934 Act, the Corporation shall promptly notify the Warrant Agent of such termination and such other information as the Warrant Agent may require at the



---



- 46 -



time. The Corporation acknowledges that the Warrant Agent is relying upon the foregoing
representation and covenants in order to meet certain SEC obligations with respect to those clients who are filing with the SEC.

ARTICLE 10

GENERAL



|10.1 | Notice to the Corporation and the Warrant Agent.
|---- | ------------------------------------------------



|(a) | Unless herein otherwise expressly provided, any notice to be given hereunder to the Corporation or the Warrant
Agent shall be deemed to be validly given if delivered, sent by registered letter, postage prepaid or faxed:
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (i) | If to the Corporation:
| | --- | ----------------------

Acasti Pharma Inc.

545 Promenade du Centropolis, Suite 100, Laval, Québec, Canada, H7T 0A3

Attention: Chief Financial Officer

Telecopy: (450) 687-2272



| | (ii) | If to the Warrant Agent:
| | ---- | ------------------------

Computershare Trust Company of Canada

1500 boul. Robert-Bourassa, 7th Floor, Montréal, Québec,
Canada, H3A 3S8

Attention: General Manager, Corporate Trust

Telecopy: (514) 982-7677

and any such notice delivered in accordance with the foregoing shall be deemed to have been received and given on the date of
delivery or, if mailed, on the fifth Business Day following the date of mailing such notice or, if telecopied, on the next Business Day following the date of transmission.



|(b) | The Corporation or the Warrant Agent, as the case may be, may from time to time notify the other in the manner
provided in Section 10.1(a) of a change of address which, from the effective date of such notice and until changed by like notice, shall be the address of the Corporation or the Warrant Agent, as the case may be, for all purposes of this
Indenture.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(c) | If, by reason of a strike, lockout or other work stoppage, actual or threatened, involving postal employees,
any notice to be given to the Warrant Agent or to the Corporation hereunder could reasonably be considered unlikely to reach its destination, such notice shall be valid and effective only if it is delivered to the named officer of the party to which
it is addressed, as provided in Section 10.1(a), or given by facsimile or other means of prepaid, transmitted and recorded communication.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|10.2 | Notice to Registered Warrantholders.
|---- | ------------------------------------



|(a) | Unless otherwise provided herein, notice to the Registered Warrantholders under the provisions of this
Indenture shall be valid and effective if delivered or sent by ordinary prepaid post addressed to such holders at their post office addresses appearing on the
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 47 -



| | register hereinbefore mentioned and shall be deemed to have been effectively received and given on the date of
delivery or, if mailed, on the third Business Day following the date of mailing such notice. In the event that Warrants are held in the name of the Depository, a copy of such notice shall also be sent by electronic communication to the Depository
and shall be deemed received and given on the next Business Day it is so sent.
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(b) | If, by reason of a strike, lockout or other work stoppage, actual or threatened, involving postal employees,
any notice to be given to the Registered Warrantholders hereunder could reasonably be considered unlikely to reach its destination, such notice shall be valid and effective only if it is delivered to such Registered Warrantholders to the address for
such Registered Warrantholders contained in the register maintained by the Warrant Agent or such notice may be given, at the Corporations expense, by means of publication in the Globe and Mail, National Edition, or any other English language
daily newspaper or newspapers of general circulation in Canada, in the first such notice to be published within five business days of such event, each two successive weeks, and any so notice published shall be deemed to have been received and given
on the latest date the publication takes place.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|10.3 | Ownership of Warrants.
|---- | ----------------------

The Corporation and the Warrant Agent may deem and treat the Registered Warrantholders as the absolute owner thereof for all
purposes, and the Corporation and the Warrant Agent shall not be affected by any notice or knowledge to the contrary except where the Corporation or the Warrant Agent is required to take notice by statute or by order of a court of competent
jurisdiction. The receipt of any such Registered Warrantholder of the Common Shares which may be acquired pursuant thereto shall be a good discharge to the Corporation and the Warrant Agent for the same and neither the Corporation nor the Warrant
Agent shall be bound to inquire into the title of any such holder except where the Corporation or the Warrant Agent is required to take notice by statute or by order of a court of competent jurisdiction.



|10.4 | Counterparts.
|---- | -------------

This Indenture may be executed in several counterparts, each of which when so executed shall be deemed to be an original and
such counterparts together shall constitute one and the same instrument and notwithstanding their date of execution they shall be deemed to be dated as of the date hereof. Delivery of an executed copy of the Indenture by electronic facsimile
transmission or other means of electronic communication capable of producing a printed copy will be deemed to be execution and delivery of this Indenture as of the date hereof.



|10.5 | Satisfaction and Discharge of Indenture.
|---- | ----------------------------------------

Upon the earlier of:



| | (i) | the date by which there shall have been delivered to the Warrant Agent for exercise or cancellation all
Warrants theretofore Authenticated hereunder, in the case of Certificated Warrants, or by way of a Transaction Instruction (or such other instructions, in a form satisfactory to the Warrant Agent), in the case of
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 48 -



| | Uncertificated Warrants, or by way of standard processing through the Book Based System in the case of a CDS
Global Warrant; and
| | --------------------------------------------------------------------------------------------------------------------------------



| | (ii) | the Expiry Time;
| | ---- | ----------------

and if all certificates or other entry on the register representing Common Shares required to be issued in compliance with the provisions
hereof have been issued and delivered hereunder or to the Warrant Agent in accordance with such provisions, this Indenture shall cease to be of further effect and the Warrant Agent, on demand of and at the cost and expense of the Corporation and
upon delivery to the Warrant Agent of a certificate of the Corporation stating that all conditions precedent to the satisfaction and discharge of this Indenture have been complied with, shall execute proper instruments acknowledging satisfaction of
and discharging this Indenture. Notwithstanding the foregoing, the indemnities provided to the Warrant Agent by the Corporation hereunder shall remain in full force and effect and survive the termination of this Indenture.



|10.6 | Provisions of Indenture and Warrants for the Sole Benefit of Parties and Registered Warrantholders.
|---- | ---------------------------------------------------------------------------------------------------

Nothing in this Indenture or in the Warrants, expressed or implied, shall give or be construed to
give to any person other than the parties hereto and the Registered Warrantholders, as the case may be, any legal or equitable right, remedy or claim under this Indenture, or under any covenant or provision herein or therein contained, all such
covenants and provisions being for the sole benefit of the parties hereto and the Registered Warrantholders.



|10.7 | Common Shares or Warrants Owned by the Corporation or its Subsidiaries  Certificate to be Provided.
|---- | ----------------------------------------------------------------------------------------------------

For the purpose of disregarding any Warrants owned legally or beneficially by the Corporation in
Section 7.16, the Corporation shall provide to the Warrant Agent, from time to time, a certificate of the Corporation setting forth as at the date of such certificate:



| | (i) | the names (other than the name of the Corporation) of the Registered Warrantholders which, to the knowledge of
the Corporation, hold Warrants which are owned by or held for the account of the Corporation; and
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | the number of Warrants owned legally or beneficially by the Corporation,
| | ---- | ------------------------------------------------------------------------

and the Warrant Agent, in making the computations in Section 7.16, shall be entitled to rely on such certificate without any additional
evidence.



|10.8 | Severability.
|---- | -------------

If, in any jurisdiction, any provision of this Indenture or its application to any party or circumstance is restricted,
prohibited or unenforceable, such provision will, as to such jurisdiction, be ineffective only to the extent of such restriction, prohibition or unenforceability without invalidating the remaining provisions of this Indenture and without affecting
the validity or enforceability of such provision in any other jurisdiction or without affecting its application to other parties or circumstances.



---



- 49 -



|10.9 | Force Majeure.
|---- | --------------

No party shall be liable to the other, or held in breach of this Indenture, if prevented, hindered, or delayed in the
performance or observance of any provision contained herein by reason of act of God, riots, terrorism, acts of war, epidemics, governmental action or judicial order, earthquakes, or any other similar causes (including, but not limited to,
mechanical, electronic or communication interruptions, disruptions or failures). Performance times under this Indenture shall be extended for a period of time equivalent to the time lost because of any delay that is excusable under this Section.



|10.10 | Assignment, Successors and Assigns.
|----- | -----------------------------------

Neither of the parties hereto may assign its rights or interest under this Indenture, except as provided in Section 9.8
in the case of the Warrant Agent, or as provided in Section 8.2 in the case of the Corporation. Subject thereto, this Indenture shall enure to the benefit of and be binding upon the parties hereto and their respective successors and permitted
assigns.



|10.11 | Rights of Rescission and Withdrawal for Holders.
|----- | ------------------------------------------------

Should a holder of Warrants exercise any legal, statutory, contractual or other right of withdrawal or rescission that may be
available to it, and the holders funds which were paid on exercise have already been released to the Corporation by the Warrant Agent, the Warrant Agent shall not be responsible for ensuring the exercise is cancelled and a refund is paid back
to the holder. In such cases, the holder shall seek a refund directly from the Corporation and subsequently, the Corporation, upon surrender to the Corporation or the Warrant Agent of any Common Shares that may have been issued, or such other
procedure as agreed to by the parties hereto, shall instruct the Warrant Agent in writing, to cancel the exercise transaction and any such Common Shares on the register, which may have already been issued upon the Warrant exercise. In the event that
any payment is received from the Corporation by virtue of the holder being a shareholder for such Warrants that were subsequently rescinded, such payment must be returned by the Corporation to such holder. The Warrant Agent shall not be under any
duty or obligation to take any steps to ensure or enforce that the funds are returned pursuant to this section, nor shall the Warrant Agent be in any other way responsible in the event that any payment is not delivered or received pursuant to this
section. Notwithstanding the foregoing, in the event that the Corporation provides the refund to the Warrant Agent for distribution to the holder, the Warrant Agent shall return such funds to the holder as soon as reasonably practicable, and in so
doing, the Warrant Agent shall incur no liability with respect to the delivery or non-delivery of any such funds.



|10.12 | Language
|----- | --------

The parties hereto confirm their express wish that this Indenture and all documents and agreements directly or indirectly
relating thereto be drawn up in the English language. Notwithstanding such express wish, the parties agree that any such document or agreement, or any part thereof or of this Indenture, may be drawn up in the French language. Les parties aux
présentes confirment leur volonté expresse que la présente convention ainsi que tous les documents et conventions sy rattachant directement ou indirectement soient rédigés en anglais. Nonobstant cette
volonté expresse, les parties aux présentes conviennent que la présente



---



- 50 -



convention ainsi que tous les documents et conventions sy rattachant directement ou
indirectement, ou toute partie de ceux-ci, puissent être rédigés en français.

[Signature page
follows]



---

IN WITNESS WHEREOF the parties hereto have executed this Indenture under the hands of
their proper officers in that behalf as of the date first written above.



ACASTI PHARMA INC.By:Name: Jan DAlviseTitle: President and Chief Executive Officer




COMPUTERSHARE TRUST COMPANY OF CANADABy:Name:Title:By:Name:Title:




---



A-1



SCHEDULE A

FORM OF WARRANT CERTIFICATE

[For all Warrants sold outside the United States and registered in the name of the Depository, include the following
legend:]

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF CDS CLEARING AND DEPOSITORY SERVICES
INC. (CDS) TO ACASTI PHARMA INC. (THE ISSUER) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IN RESPECT THEREOF IS REGISTERED IN THE NAME OF CDS & CO., OR
SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF CDS (AND ANY PAYMENT IS MADE TO CDS & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF CDS), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE
OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED HOLDER HEREOF, CDS & CO., HAS A PROPERTY INTEREST IN THE SECURITIES REPRESENTED BY THIS CERTIFICATE HEREIN AND IT IS A VIOLATION OF ITS RIGHTS FOR ANOTHER PERSON TO HOLD,
TRANSFER OR DEAL WITH THIS CERTIFICATE.

[If applicable, each Warrant Certificate originally issued for
the benefit or account of a U.S. Warrantholder and each Warrant Certificate issued in exchange therefor or in substitution thereof, shall bear the following legends or such variations thereof as the Corporation may prescribe:]THIS WARRANT
AND THE SECURITIES DELIVERABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE U.S. SECURITIES ACT), OR ANY STATE SECURITIES LAWS, AND MAY BE OFFERED, SOLD, PLEDGED OR
OTHERWISE TRANSFERRED, DIRECTLY OR INDIRECTLY, ONLY (A) TO ACASTI PHARMA INC. (THE CORPORATION) (B) OUTSIDE THE UNITED STATES IN COMPLIANCE WITH RULE 904 OF REGULATION S UNDER THE U.S. SECURITIES ACT AND IN COMPLIANCE WITH
APPLICABLE LOCAL LAWS AND REGULATIONS, (C) WITHIN THE UNITED STATES IN ACCORDANCE WITH THE EXEMPTION FROM REGISTRATION UNDER THE U.S. SECURITIES ACT PROVIDED BY (1) RULE 144A UNDER THE U.S. SECURITIES ACT OR (2) IF AVAILABLE, RULE 144
UNDER THE U.S. SECURITIES ACT AND, IN EACH CASE, IN COMPLIANCE WITH APPLICABLE STATE SECURITIES LAWS, OR (D) IN A TRANSACTION THAT DOES NOT REQUIRE REGISTRATION UNDER THE U.S. SECURITIES ACT OR ANY APPLICABLE STATE SECURITIES LAWS, PROVIDED
THAT IN THE CASE OF TRANSFERS PURSUANT TO (C)(2) OR (D) ABOVE, A LEGAL OPINION SATISFACTORY TO THE CORPORATION MUST FIRST BE PROVIDED TO COMPUTERSHARE TRUST COMPANY OF CANADA TO THE EFFECT THAT SUCH TRANSFER MAY BE EFFECTED WITHOUT REGISTRATION
UNDER THE U.S. SECURITIES ACT AND APPLICABLE STATE SECURITIES LAWS. DELIVERY OF THIS CERTIFICATE MAY NOT CONSTITUTE GOOD



---



A-2



DELIVERY IN SETTLEMENT OF TRANSACTIONS ON STOCK EXCHANGES IN CANADA.

THE SECURITIES EVIDENCED HEREBY AND THE SECURITIES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER
THE U.S. SECURITIES ACT OR U.S. STATE SECURITIES LAWS. THESE WARRANTS MAY NOT BE EXERCISED IN THE UNITED STATES OR BY OR ON BEHALF OF, OR FOR THE ACCOUNT OR BENEFIT OF, A U.S. PERSON UNLESS AN EXEMPTION FROM REGISTRATION UNDER THE U.S. SECURITIES
ACT AND ANY APPLICABLE STATE SECURITIES LAWS IS AVAILABLE AND THE CORPORATION HAS RECEIVED AN OPINION OF COUNSEL OF RECOGNIZED STANDING TO SUCH EFFECT IN FORM AND SUBSTANCE REASONABLY SATISFACTORY TO THE CORPORATION. UNITED STATES AND
U.S. PERSON ARE AS DEFINED BY REGULATION S UNDER THE U.S. SECURITIES ACT. IF REQUESTED BY THE CORPORATION, THE HOLDER AGREES TO PROVIDE THE INFORMATION NECESSARY TO DETERMINE WHETHER THE TRANSFER OR EXERCISE OF THIS WARRANT IS
PERMISSIBLE UNDER THE U.S. SECURITIES ACT.]

SUBJECT TO THE CORPORATIONS ACCELERATION RIGHT, THE WARRANTS
EVIDENCED HEREBY ARE EXERCISABLE AT OR BEFORE 5:00 P.M. (MONTREAL TIME) ON FEBRUARY 21, 2022, AFTER WHICH TIME THE WARRANTS EVIDENCED HEREBY SHALL BE DEEMED TO BE VOID AND OF NO FURTHER FORCE OR EFFECT.

WARRANT

To acquire
Common Shares of

ACASTI PHARMA INC.

(incorporated pursuant to the laws of the Province of Québec)



|                  |  |                                                                                                                                                 |  | 
|----------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------- |  | 
|Warrant           |  | Certificate for                                                                                                                                 |  | 
|Certificate No. ● |  |                                                                                                                                                
|                  |  | Warrants, each entitling the holder to acquire one (1) Common Share subject to adjustment in accordance with
the terms of the Warrant Indenture

CUSIP:●

ISIN:●

THIS IS TO CERTIFY
THAT, for value received,







---



A-3



(the Warrantholder) is the registered holder of the number of common share
purchase warrants (the Warrants) of Acasti Pharma Inc. (the Corporation) specified above, and is entitled, on exercise of these Warrants upon and subject to the terms and conditions set forth herein and in the
Warrant Indenture hereinafter referred to, to purchase at any time before 5:00 p.m. (Montreal time) (the Expiry Time) on February 21, 2022 (the Expiry Date), subject to the Acceleration Right, one fully
paid and non-assessable common share without par value in the capital of the Corporation as constituted on the date hereof (a Common Share) for each Warrant subject to adjustment in accordance with the terms of the Warrant
Indenture.

For the purpose of this Warrant Certificate and the Warrant Indenture, Acceleration Right means the right of the
Company to accelerate the Expiry Date to a date that is not the less than 30 days following delivery of the Acceleration Notice if, at any time at least four months following the Effective Date, the volume weighted average trading price of the
Common Shares equals or exceeds $2.65 for a period of 20 consecutive trading dates on the TSXV.

The Warrants evidenced hereby are
exercisable at or before 5:00 p.m. (Montreal time) on February 21, 2022 after which time the warrants evidenced hereby shall be deemed to be void and of no further force or effect.

The right to purchase Common Shares may only be exercised by the Warrantholder within the time set forth above by:



| | (a) | duly completing and executing the exercise form (the Exercise Form) attached hereto; and
| | --- | ------------------------------------------------------------------------------------------



| | (b) | surrendering this warrant certificate (the Warrant Certificate), with the Exercise Form to
the Warrant Agent at the principal office of the Warrant Agent, in the city of Montreal, Québec, together with a certified cheque, bank draft or money order in the lawful money of Canada payable to or to the order of the Corporation in an
amount equal to the aggregate Exercise Price (as defined herein) for the Common Shares so subscribed for.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The surrender
of this Warrant Certificate, the duly completed Exercise Form and payment as provided above will be deemed to have been effected only on personal delivery thereof to, or if sent by mail or other means of transmission on actual receipt thereof by,
the Warrant Agent at its principal office as set out above.

Subject to adjustment thereof in the events and in the manner set forth in
the Warrant Indenture hereinafter referred to, the exercise price payable for each Common Share upon the exercise of the Warrants shall be CAD$2.15 per Common Share (the Exercise Price) .

Certificates for the Common Shares subscribed for will be mailed to the persons specified in the Exercise Form at their respective addresses
specified therein or, if so specified in the Exercise Form, delivered to such persons at the office where this Warrant Certificate is surrendered. If fewer Common Shares are purchased than the number that can be purchased pursuant to this Warrant
Certificate, the holder hereof will be entitled to receive without charge a new Warrant Certificate in respect of the balance of the Common Shares not so purchased. No fractional Common Shares will be issued upon exercise of any Warrant.



---



A-4



This Warrant Certificate evidences Warrants of the Corporation issued or issuable under the
provisions of a warrant indenture (which indenture together with all other instruments supplemental or ancillary thereto is herein referred to as the Warrant Indenture) dated as of February 21, 2017 between the Corporation
and Computershare Trust Company of Canada, as Warrant Agent, to which Warrant Indenture reference is hereby made for particulars of the rights of the holders of Warrants, the Corporation and the Warrant Agent in respect thereof and the terms and
conditions on which the Warrants are issued and held, all to the same effect as if the provisions of the Warrant Indenture were herein set forth, to all of which the holder, by acceptance hereof, assents. The Corporation will furnish to the holder,
on request and without charge, a copy of the Warrant Indenture.

The Warrants evidenced hereby shall not be exercised by any U.S.
Warrantholder, or any other person requesting delivery of the Common Shares issuable upon exercise of the Warrants in or into the United States must (a) provide a completed and executed U.S. Purchaser Letter or (b) an opinion of counsel of
recognised standing in form and substance reasonably satisfactory to the Corporation and the Warrant Agent that the exercise and delivery is exempt from the registration requirements of applicable securities laws of any state of the United States
and the U.S. Securities Act; provided, however a U.S. Warrantholder that is the original purchaser of Warrants and who has delivered the U.S. Accredited Investor Certificate attached to the subscription agreement of the Corporation in
connection with its purchase of Units pursuant to the U.S. Placement, will not be required to deliver a U.S. Purchaser Letter or an opinion of counsel in connection with the due exercise of the Warrant at a time when the representations, warranties
and covenants made by the Warrantholder in the U.S. Accredited Investor Certificate remain true and correct and the Warrantholder represents to the Corporation as such.

On presentation at the principal office of the Warrant Agent as set out above, subject to the provisions of the Warrant Indenture and on
compliance with the reasonable requirements of the Warrant Agent, one or more Warrant Certificates may be exchanged for one or more Warrant Certificates entitling the holder thereof to purchase in the aggregate an equal number of Common Shares as
are purchasable under the Warrant Certificate(s) so exchanged.

The Warrant Indenture contains provisions for the adjustment of the
Exercise Price per Common Share upon the exercise of Warrants and the number of Common Shares issuable upon the exercise of Warrants in the events and in the manner set forth therein.

The Warrant Indenture also contains provisions making binding on all holders of Warrants outstanding thereunder resolutions passed at meetings
of holders of Warrants held in accordance with the provisions of the Warrant Indenture and instruments in writing signed by Warrantholders entitled to purchase a specific majority of the Common Shares that can be purchased pursuant to such Warrants.

Nothing contained in this Warrant Certificate, the Warrant Indenture or elsewhere shall be construed as conferring upon the holder hereof
any right or interest whatsoever as a holder of Common Shares or any other right or interest except as herein and in the Warrant Indenture expressly provided. In the event of any discrepancy between anything contained in this Warrant Certificate and
the terms and conditions of the Warrant Indenture, the terms and conditions of the Warrant Indenture shall govern.



---



A-5



Warrants may only be transferred in compliance with the conditions of the Warrant Indenture on
the register to be kept by the Warrant Agent in Montreal, Québec, or such other registrar as the Corporation, with the approval of the Warrant Agent, may appoint at such other place or places, if any, as may be designated, upon surrender of
this Warrant Certificate to the Warrant Agent or other registrar accompanied by a written instrument of transfer in form and execution satisfactory to the Warrant Agent or other registrar and upon compliance with the conditions prescribed in the
Warrant Indenture and with such reasonable requirements as the Warrant Agent or other registrar may prescribe and upon the transfer being duly noted thereon by the Warrant Agent or other registrar. Time is of the essence hereof.

This Warrant Certificate will not be valid for any purpose until it has been countersigned by or on behalf of the Warrant Agent from time to
time under the Warrant Indenture.

The parties hereto have declared that they have required that these presents and all other
documents related hereto be in the English language. Les parties aux présentes déclarent quelles ont exigé que la présente convention, de même que tous les documents sy rapportant, soient
rédigés en anglais.

[Signature page follows]



---



A-6



IN WITNESS WHEREOF the Corporation has caused this Warrant Certificate to be duly executed
as of
,
.



ACASTI PHARMA INC.By:Authorized Signatory




|                                      |  |                     
|------------------------------------- |  | --------------------
|Countersigned and Registered by:     
|                                     
|COMPUTERSHARE TRUST
COMPANY OF CANADA
|                                      | 
|By:                                   |  |                     
|                                      |  | Authorized Signatory
|                                      | 
|Date:                                 |  |                     



---



C-1



SCHEDULE B

FORM OF TRANSFER CERTIFICATE

To:
Computershare Trust Company of Canada

RE: Transfer of Warrants under the Warrant Indenture (the Warrant Indenture),
dated as of February 21, 2017, between Acasti Pharma Inc. (the Corporation) and Computershare Trust Company of Canada, as Warrant Agent

FOR VALUE RECEIVED the undersigned hereby sells, assigns and transfers to









(print name and address) the Warrants
represented by this Warrants Certificate and hereby irrevocable constitutes and appoints
 as its attorney with full
power of substitution to transfer the said securities on the appropriate register of the Warrant Agent. Capitalized terms used herein and not otherwise defined have the meanings set forth in the Warrant Indenture.

In the case of a warrant certificate that contains a U.S. Warrant Legend, the undersigned hereby represents, warrants and certifies that (one
(only) of the following must be checked):



| | ☐ | (A)     the transfer is being made only to the Corporation;
| | - | -----------------------------------------------------------



| | ☐ | (B)     the transfer is being made outside the United States in accordance with Rule 904
of Regulation S under the U.S. Securities Act, and in compliance with any applicable local securities laws and regulations and the holder has provided herewith the Declaration for Removal of Legend attached as Schedule D to the
Warrant Indenture, or
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | ☐ | (C)     the transfer is being made within the United States or to, or for the account or
benefit of, U.S. Persons, in accordance in accordance with the exemption from registration under the U.S. Securities Act provided by (i) Rule 144A under the U.S. Securities Act, (ii) if available, Rule 144 under the U.S.
Securities Act and, in each case, in compliance with applicable state securities laws, or (iii) in a transaction that does not require registration under the U.S. Securities Act or any applicable state securities laws, and the undersigned has
furnished to the Corporation and the Warrant Agent an opinion of counsel of recognized standing in form and substance reasonably satisfactory to the Corporation and the Warrant Agent to such effect.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

In the case of a warrant certificate that does not contain a U.S. Warrant Legend, if the proposed transfer is to, or for the
account or benefit of a U.S. Warrantholder or to a person in the United States, the undersigned hereby represents, warrants and certifies that the transfer of the Warrants is being completed pursuant to an exemption from the registration
requirements of the U.S. Securities Act and any applicable state securities laws, in which case the undersigned has furnished to the Corporation and the Warrant Agent an opinion of counsel of recognized



---



C-2



standing in form and substance reasonably satisfactory to the Corporation and the Warrant Agent
to such effect.



|☐ | If transfer is to a U.S. Person, check this box.
|- | ------------------------------------------------

DATED this  day
of, 20.



|                                           |  |                         |                    | 
|------------------------------------------ |  | ----------------------- | ------------------ | 
|                                           |  |                        
|SPACE FOR GUARANTEES OF
SIGNATURES (BELOW) |  | )
) )                   |                    | 
|                                           |  | Signature of Transferor
|                                           |  | )
) )
)                 |                    | 
|Guarantors Signature/Stamp                |  |                         | Name of Transferor

REASON FOR TRANSFER  For US Residents only (where the individual(s) or corporation receiving the
securities is a US resident). Please select only one (see instructions below).

☐ Gift
                 ☐ Estate              ☐ Private Sale
             ☐ Other (or no change in ownership)

Date of Event (Date of gift,
death or sale):                  Value per Warrant on the date of event:







|         |  |  |  |                             |  |            
|-------- |  |  |  | --------------------------- |  | -----------
|/      / |  |  |  | $                   
     . |  | ☐CAD OR☐USD

CERTAIN REQUIREMENTS RELATING TO TRANSFERS  READ CAREFULLY





The signature(s) of the transferor(s) must correspond with the name(s) as written upon the face of this certificate(s), in every particular,
without alteration or enlargement, or any change whatsoever. All securityholders or a legally authorized representative must sign this form. The signature(s) on this form must be guaranteed in accordance with the transfer agents then current
guidelines and requirements at the time of transfer. Notarized or witnessed signatures are not acceptable as guaranteed signatures. As at the time of closing, you may choose one of the following methods (although subject to change in accordance with
industry practice and standards):



| |  |  | Canada and the USA: A Medallion Signature Guarantee obtained from a member of an acceptable Medallion
Signature Guarantee Program (STAMP, SEMP, NYSE, MSP). Many commercial banks, savings banks, credit unions, and all broker dealers participate in a Medallion Signature Guarantee Program. The Guarantor must affix a stamp bearing the actual words
Medallion Guaranteed, with the correct prefix covering the face value of the certificate.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



C-3



| |  |  | Canada:A Signature Guarantee obtained from an authorized officer of the Royal Bank of Canada, Scotia
Bank or TD Canada Trust. The Guarantor must affix a stamp bearing the actual words Signature Guaranteed, sign and print their full name and alpha numeric signing number. Signature Guarantees are not accepted from Treasury Branches,
Credit Unions or Caisse Populaires unless they are members of a Medallion Signature Guarantee Program. For corporate holders, corporate signing resolutions, including certificate of incumbency, are also required to accompany the transfer, unless
there is a Signature & Authority to Sign Guarantee Stamp affixed to the transfer (as opposed to a Signature Guaranteed Stamp) obtained from an authorized officer of the Royal Bank of Canada, Scotia Bank or TD Canada
Trust or a Medallion Signature Guarantee with the correct prefix covering the face value of the certificate.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Outside North America: For holders located outside North America, present the certificates(s) and/or
document(s) that require a guarantee to a local financial institution that has a corresponding Canadian or American affiliate which is a member of an acceptable Medallion Signature Guarantee Program. The corresponding affiliate will arrange for the
signature to be over-guaranteed.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

OR

The signature(s) of the transferor(s) must correspond with the name(s) as written upon the face of this certificate(s), in every particular,
without alteration or enlargement, or any change whatsoever. The signature(s) on this form must be guaranteed by an authorized officer of Royal Bank of Canada, Scotia Bank or TD Canada Trust whose sample signature(s) are on file with the transfer
agent, or by a member of an acceptable Medallion Signature Guarantee Program (STAMP, SEMP, NYSE, MSP). Notarized or witnessed signatures are not acceptable as guaranteed signatures. The Guarantor must affix a stamp bearing the actual words:
SIGNATURE GUARANTEED, MEDALLION GUARANTEED OR SIGNATURE & AUTHORITY TO SIGN GUARANTEE, all in accordance with the transfer agents then current guidelines and requirements at the time of transfer.
For corporate holders, corporate signing resolutions, including certificate of incumbency, will also be required to accompany the transfer unless there is a SIGNATURE & AUTHORITY TO SIGN GUARANTEE Stamp affixed to the Form of
Transfer obtained from an authorized officer of the Royal Bank of Canada, Scotia Bank or TD Canada Trust or a MEDALLION GUARANTEED Stamp affixed to the Form of Transfer, with the correct prefix covering the face value of the certificate.

REASON FOR TRANSFER  FOR US RESIDENTS ONLY

Consistent with US IRS regulations, Computershare is required to request cost basis information from US securityholders. Please indicate the
reason for requesting the transfer as well as the date of event relating to the reason. The event date is not the day in which the transfer is finalized, but rather the date of the event which led to the transfer request (i.e. date of gift, date of
death of the securityholder, or the date the private sale took place).



---



D-1



SCHEDULE C

EXERCISE FORM



|                                                                                                                                                                                                           |  |                                                                                                                                                                       
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
|TO: Acasti Pharma Inc.
 AND TO:
 Computershare Trust Company of Canada
c/o of Corporate Trust Services
1500 Robert Bourassa Street, Suite 700
Montréal, Québec H3A 3S8
Attention: Manager, Corporate Trust |  | OR TO: 
Computershare Trust Company of Canada
c/o of Corporate Trust Services
100 University Avenue, Suite 800
Toronto, ON M5J 2Y1 Attention:
Manager, Corporate Trust

The undersigned hereby exercises the right of such holder to be issued, and hereby subscribes for, Common
Shares that are issuable pursuant to the exercise of such Warrants on the terms specified in such Warrant Certificate and in the Warrant Indenture dated February 21, 2017 between Computershare Trust Company of Canada and Acasti Pharma Inc. (the
Warrant Indenture).

The undersigned holder of the Warrants evidenced by this Warrant Certificate hereby exercises the
right to acquire  Common Shares of Acasti Pharma
Inc. for an aggregate purchase price of CAD$.



|  |  |                                                                                                                                                                                                                                                                                                                   
|- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|❑ |  | Please check if this Exercise Form is being exercised by or on behalf of a U.S. Warrantholder, or in connection with a
request for delivery of the Common Shares issuable upon exercise of the Warrants in or into the United States (in which case, additional documentation and certifications may be required).

Exercise Price Payable:equals CAD$2.15 for each Common Share, subject to adjustment in accordance with
the Warrant Indenture.

Capitalized terms used herein have the meaning ascribed to them in the Warrant Indenture.

The undersigned hereby irrevocably directs that the said Common Shares be issued, registered and delivered as follows:



|                |  |  |  |             |  |  |  |                        
|--------------- |  |  |  | ----------- |  |  |  | -----------------------
|Name(s) in Full |  |  |  | Address(es) |  |  |  | Number of
Common Shares
|                |  |  |  |            
|                |  |  |  |             |  |  |  |                        
|                |  |  |  |            
|                |  |  |  |             |  |  |  |                        
|                |  |  |  |            
|                |  |  |  |             |  |  |  |                        



---



D-2



| |  |  |  |  |  |  |  | 
| |  |  |  |  |  |  |  | 
| |  |  |  | 
| |  |  |  |  |  |  |  | 
| |  |  |  | 
| |  |  |  |  |  |  |  | 

Please print full name in which certificates representing the Common Shares are to be issued. If any Common
Shares are to be issued to a person or persons other than the registered holder, the registered holder must pay to the Warrant Agent all exigible transfer taxes or other government charges, if any, and the Form of Transfer must be duly executed.

Once completed and executed, this Exercise Form must be mailed or delivered to Computershare Trust Company of Canada, c/o Corporate Trust
Services, 1500 Robert Bourassa Street, Suite 700, Montréal, Quebec H3A 3S8.

It is understood that the Corporation and
Computershare Trust Company of Canada may require evidence to verify the foregoing representation.

DATED _______________________, 20__.



|        |  |  |  |                                                                                              
|------- |  |  |  | ---------------------------------------------------------------------------------------------
|        |  | 
|        |  |  |  |                                                                                              
|Witness |  |  |  | Signature of Warrantholder, to be the same as appears on the face of this Warrant Certificate
|        |  | 
|        |  |  |  |                                                                                              
|        |  |  |  | Name of Registered Warrantholder                                                             



|  |  |                                                                                                                                                                                                                                                                                                                                                                    
|- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|❑ |  | Please check if the certificates representing the Common Shares are to be delivered at the office where this Warrant
Certificate is surrendered, failing which such certificates will be mailed to the address set out above. Certificates will be delivered or mailed as soon as practicable after the surrender of this Warrant Certificate to the Warrant
Agent.



---



D-3



SCHEDULE D

FORM OF DECLARATION FOR REMOVAL OF LEGEND



|TO: | Computershare Trust Company of Canada
|--- | -------------------------------------

| | Computershare Investor Services Ltd., as registrar and transfer agent for the Warrants and Common Shares
issuable upon exercise of the Warrants of Acasti Pharma Inc.
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------

The undersigned (a) acknowledges that the sale of the
securities of Acasti Pharma Inc. (the Corporation) to which this declaration relates is being made in reliance on Rule 904 of Regulation S under the United States Securities Act of 1933, as amended (the U.S. Securities
Act) and (b) certifies that (1) the undersigned is not (i) an affiliate of the Corporation (as that term is defined in Rule 405 under the U.S. Securities Act), (ii) a distributor as defined in
Regulation S under the U.S. Securities Actor (iii) an affiliate of a distributor, (2) the offer of such securities was not made to a person in the United States and either (A) at the time the buy order was originated, the buyer was
outside the United States, or the seller and any person acting on its behalf reasonably believed that the buyer was outside the United States, or (B) the transaction was executed in, on or through the facilities of a designated offshore
securities market (such as the TSX Venture Exchange or the Toronto Stock Exchange) and neither the seller nor any person acting on its behalf knows that the transaction has been prearranged with a buyer in the United States or a U.S. person,
(3) neither the seller nor any affiliate of the seller nor any person acting on any of their behalf has engaged or will engage in any directed selling efforts in the United States in connection with the offer and sale of such securities,
(4) the sale is bona fide and not for the purpose of washing off the resale restrictions imposed because the securities are restricted securities (as such term is defined in Rule 144(a)(3) under the U.S.
Securities Act), (5) the seller does not intend to replace the securities sold in reliance on Rule 904 of the U.S. Securities Act with fungible unrestricted securities and (6) the contemplated sale is not a transaction, or part of a series
of transactions which, although in technical compliance with Regulation S, is part of a plan or scheme to evade the registration provisions of the U.S. Securities Act. Terms used herein have the meanings given to them by Regulation S.

DATED this _____ day of __________, 20__.

(Name of Seller)By:Name: [*]Title:   [*]


Affirmation By Sellers Broker-Dealer (required for sales in accordance with Section (b)(2)(B) above)

We have read the foregoing representations of our customer,
 (the
Seller) dated , with regard to
our sale, for such Sellers account, of the securities of the Corporation described therein, and on behalf of ourselves we certify and affirm that (A) we have no knowledge that the transaction had been prearranged with a buyer in the
United States, (B) the transaction was executed on or through the facilities of designated offshore securities market, (C) neither we, nor any person acting on our behalf, engaged in any directed selling efforts in connection with the
offer and sale of such securities, and (D) no selling concession, fee or other remuneration is being paid to us in connection with this offer and sale other than the usual and customary brokers commission that would be received by a
person executing such transaction as agent. Terms used herein have the meanings given to them by Regulation S under the U.S. Securities Act.

|             |  |                   
|------------ |  | ------------------
|             | 
|             |  |                   
|Name of Firm
|             | 
|By:          |  |                   
|             |  | Authorized officer
|             | 
|Date:        |  | __________        



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SCHEDULE E

FORM OF U.S. PURCHASER CERTIFICATION UPON EXERCISE OF WARRANTS

Acasti Pharma Inc.

545 Promenade du Centropolis,
Suite 100, Laval, Québec, Canada, H7T 0A3

Attention: Chief Financial Officer

- and to -

Computershare Trust Company of Canada.

as Warrant Agent

Dear Sirs:

We are delivering this letter in connection with the purchase of common shares (the Common Shares) of Acasti Pharma Inc., a
corporation incorporated under the laws of the Province of Québec (the Corporation) upon the exercise of warrants of the Corporation (Warrants), issued under the warrant indenture dated as of
February 21, 2017 between the Corporation and Computershare Trust Company of Canada.

We hereby confirm that:



| | (a) | we are an institutional accredited investor (satisfying one or more of the criteria set
forth in Rule 501 (a)(1),(2),(3) or (7) of Regulation D under the United States Securities Act of 1933 (the U.S. Securities Act)) who is also a Qualified Purchaser (as defined in Section 2(a)
(51) of, and related rules under, the United States Investment Company Act of 1940, as amended (the 1940 Act));
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (b) | we are purchasing the Common Shares for our own account;
| | --- | --------------------------------------------------------



| | (c) | we have such knowledge and experience in financial and business matters that we are capable of evaluating the
merits and risks of purchasing the Common Shares;
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (d) | we are not acquiring the Common Shares with a view to distribution thereof or with any present intention of
offering or selling any of the Common Shares, except (A) to the Corporation, (B) outside the United States in accordance with Rule 904 under the U.S. Securities Act or (C) inside the United States in accordance with Rule 144 under the
U.S. Securities Act, if applicable, and in compliance with applicable state securities laws;
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (e) | we acknowledge that we have had access to such financial and other information as we deem necessary in
connection with our decision to exercise the Warrants and purchase the Common Shares; and
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (f) | we acknowledge that we are not purchasing the Common Shares as a result of any general solicitation or general
advertising, including advertisements, articles, notices or other communications published in any newspaper, magazine or similar media or broadcast over radio, television, or any seminar or meeting whose attendees have been invited by general
solicitation or general advertising.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---



- 2 -



We understand that the Common Shares are being offered in a transaction not involving any public
offering within the United States within the meaning of the U.S. Securities Act and that the Common Shares have not been and will not be registered under the U.S. Securities Act.

We further understand that any Common Shares acquired by us will be in the form of definitive physical certificates and that such certificates
will bear a legend reflecting the fact that we will not offer, sell or otherwise transfer any of the Common Shares, directly or indirectly, unless (i) the sale is to the Corporation; (ii) the sale is made outside the United States in
compliance with the requirements of Rule 904 of Regulation S under the U.S. Securities Act; or (iii) the sale is made in the United States pursuant to an exemption from registration under the U.S. Securities Act provided by (A) Rule 144A
under the U.S. Securities Act or (2) if available, Rule 144 under the U.S. Securities Act and, in each case, in compliance with applicable state securities laws, or (iv) in a transaction that does not require registration under the U.S.
Securities Act or any applicable state securities laws; and, in the case of clause (iii)(B) or clause (iv), and, prior to such sale or transfer, the seller has furnished to the Corporation and the Corporations transfer agent an opinion of
counsel of recognized standing in form and substance reasonably satisfactory to the Corporation and such Transfer Agent to the effect that the proposed transfer may be effected without registration under the U.S. Securities Act or applicable state
securities laws.

We acknowledge that you will rely upon our confirmations, acknowledgements and agreements set forth herein, and we agree
to notify you promptly in writing if any of our representations or warranties herein ceases to be accurate or complete.

DATED this _____ day of
______, 20__.



(Name of U.S. Purchaser)By:Name: [*]Title:   [*]