Exhibit 10.6





EMPLOYMENT AGREEMENT



THIS AGREEMENTmade as of the13th
day of May, 2015.



BETWEEN:



CYNAPSUS THERAPEUTICS INC.



(hereinafter called “Cynapsus”)



- and -



ANDREW WILLIAMS



(hereinafter called the“Executive”)



WHEREAS Cynapsus is developing a sublingual
thin filmstrip for the acute rescue of OFF motor symptoms of Parkinson’s disease;



AND WHEREAS Cynapsus and the Executive
entered into an original employment agreement dated as of January 1, 2006, as amended on January 1, 2012, as further amended on
May 1, 2013, and as further amended on January 1, 2015;



AND WHEREAS Cynapsus and the Executive
have agreed to further amend the terms of the employment relationship.



NOW THEREFORE THIS AGREEMENT WITNESSES
that in consideration of the mutual covenants and agreements contained herein and other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties covenant and agree as follows:



Article
1 - DUTIES



1.1                        The Executive
will continue to be the Chief Operating Officer and Chief Financial Officer of Cynapsus and to exercise all of the duties and responsibilities
of such office and to perform such other services as the board of directors of Cynapsus (the “Board”) may reasonably
request the Executive from time to time. The duties of the Executive shall include, but are not limited to, the company’s
public company operations on the Toronto Stock Exchange and the U.S. OTCQX, as well as all regulatory, finance, accounting, tax,
audit, legal, information systems, communications and administrative functions. The Executive will report to the President and
CEO and also serve as the Corporate Secretary, working closely with the Board and Board Committees. In addition, the Executive
shall serve in such other capacities, perform such other duties and exercise such other powers consistent with such activities
as may from time to time be assigned to or vested in him by the Board.













1.2Duringhis
employment hereunder, the Executive shall devote his full time and attention to the business and affairs of Cynapsus and shall
well and faithfully serve Cynapsus and use his best efforts to promote the interests and goodwill of Cynapsus. This does not preclude
the Executive from investing in private investment opportunities, it being understood that such opportunities will take immaterial
time commitment, and provided that such opportunities are not competitive with or suppliers to Cynapsus.



1.3                        The Executive
hereby confirms his employment with Cynapsus on the terms and conditions set forth in this Agreement.



Article
2 - TERM



2.1                        The parties
acknowledge that the Executive has already commenced employment with Cynapsus and that such employment shall continue for an indefinite
term until terminated in accordance with the provisions of this Agreement.



Article
3 - COMPENSATION



3.1                        For the performance
of his services hereunder and commencing on January 1, 2015, the Executive shall be paid:



(a)          A base salary (the
“Base Salary”) of $225,000 per annum, less statutory withholdings, payable to the Executive in equal instalments
on those dates on which Cynapsus normally makes salary payments to its employees and in accordance with Cynapsus’ regular
practices in that regard.



(b)          A discretionary bonus
(the “Annual Bonus”), as determined by the President and CEO and the Board, for each year of the Executive’s
employment hereunder, in an amount of 30% of the Base Salary, based on the achievement of agreed corporate objectives. The Annual
Bonus may be increased to up to 40% of the Base Salary, as determined by the Board, based on an overachievement of goals. The Annual
Bonus shall be based on criteria to be approved by the Board, and relayed to the Executive, which criteria shall reflect the annual
corporate goals of Cynapsus and individual goals relating to the Executive’s areas of oversight.



3.2                        The Executive
shall be entitled to annual reviews of his Base Salary and Annual Bonus or any changes to the bonus plan or other forms of compensation
paid or granted to the Executive by Cynapsus as may be determined from time to time by the Board. The Base Salary will take into
account the prevailing market conditions and comparative base salaries as well as changes in Cynapsus’ financial conditions,
market capitalization, growth and corporate size however measured.



3.3                        The Executive
may be granted options to acquire common shares in the capital of Cynapsus at the discretion of the Board and pursuant to the terms
and conditions of Cynapsus’ stock option plan (the “Plan”). Upon a Change of Control (as defined below)
of Cynapsus all stock options will vest immediately upon approval by the Board.





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Article
4 - EXPENSES



4.1                        It is understood
and agreed that the Executive will incur expenses in connection with performing his duties hereunder. Cynapsus will reimburse the
Executive for all expenses reasonably and properly incurred by the Executive on behalf of Cynapsus provided that the Executive
provides to Cynapsus receipts acceptable to Cynapsus within a reasonable period after they have been incurred. All expenses shall
be incurred in accordance with agreed corporate policies and budgets.



Article
5 - BENEFITS



| | 5.1 | During the period of the employment of the Executive hereunder:
| | --- | ---------------------------------------------------------------



(a)          The Executive shall
be entitled to four weeks’ vacation per year to be taken at such times and for such durations as are acceptable to Cynapsus
and the Executive. Up to two weeks’ vacation which if not taken in any year may be taken in any subsequent year or the Executive
shall be entitled to such vacation pay as may be required pursuant to the Employment Standards Act, 2000 (Ontario).



(b)          The Executive shall
be eligible to participate in the group insurance and benefit plan provided to all senior executives of Cynapsus, to the extent
he qualifies for such benefits. The Executive’s insurance and benefit entitlements shall be subject to and governed by the
terms and conditions of the plan, as amended from time to time.



(c)          The Executive shall
be entitled, at the cost of Cynapsus, to the additional benefits set out in Schedule “A” hereto.



Article
6 - TERM AND TERMINATION



| | 6.1 | Termination with Cause
| | --- | ----------------------



(a)          Cynapsus shall be
entitled, in its sole discretion, to terminate the employment of the Executive hereunder, without notice or payment in lieu of
notice, for Cause (as hereinafter defined). Cynapsus shall have no obligation to the Executive after the effective date of termination
pursuant to this Section 6.1 except for payment of any Base Salary accrued to the date of termination and any other amounts which
have accrued but not yet been paid in accordance with any benefit plan prior to the date of termination. The Executive shall not
be entitled to receive any bonus in the event of termination pursuant to this Section 6.1.





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| | (b) | For the purposes hereof, “Cause” shall mean:
| | --- | --------------------------------------------



| | (i) | the continued or habitual failure by the Executive to substantially perform his duties according
to the terms of his employment hereunder (other than resulting from the Executive’s Disability (as hereinafter defined),
after Cynapsus has given the Executive reasonable written notice of such failure and a reasonable opportunity to correct the failure
and the Executive fails to substantially remedy the failure;
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | the Executive hereinafter does (or causes or permits to be done) or hereinafter omits (or causes
or permits to be omitted) any act or thing that ismaterially or significantly harmful or injurious to Cynapsus or any of
its affiliates, monetarily or otherwise;
| | ---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iii) | the Executive hereinafter engages in any criminal act of dishonesty, or any reprehensible behaviour
or activity, that could have an adverse effect, either directly or indirectly, on Cynapsus; or
| | ----- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iv) | any regulatory sanction that precludes the Executive from fulfilling his duties under this Agreement.
| | ---- | -----------------------------------------------------------------------------------------------------



| | 6.2 | Termination by Cynapsus without Cause
| | --- | -------------------------------------



(a)          Except as otherwise
provided, Cynapsus shall be entitled in its sole discretion to terminate this Agreement at any time upon four months’ plus
one additional month’s notice to the Executive for every full year of employment (starting from January 1, 2006), to a maximum
of 14 months, or payment in lieu of notice.



(b)          Upon termination by
Cynapsus in accordance with this Section 6.2, Cynapsus shall provide the Executive with written notice or payment in lieu thereof
and an amount equal to the average of the Annual Bonus paid to the Executive in each of the three most recent completed financial
years of Cynapsus, divided by 12 and multiplied by 14 (the “Deemed Annual Bonus”), together with all amounts
which the Executive would have been entitled to during such period and a continuation of benefits coverage during such period in
respect of the elements which are permitted to be continued in accordance with the terms of the benefit plan then in place and
applicable laws. Cynapsus shall have the option to pay the amount equal to the 14 months of Base Salary on its regular payroll
dates or in a lump sum as of the effective date of termination.



| | 6.3 | Termination by the Executive
| | --- | ----------------------------



(a)          The Executive shall
be entitled in his sole discretion to terminate this Agreement for any reason whatsoever at any time upon 60 days’ prior
written notice to Cynapsus.





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(b)          Upon termination by
the Executive in accordance with this Section 6.3, Cynapsus shall have no obligation to the Executive after the effective date
of termination except for payment of any Base Salary accrued to the date of termination, the Deemed Annual Bonus and any other
amounts which have accrued but not yet been paid prior to the date of termination, including any amounts owing in accordance with
any benefit plan.



| | 6.4 | Termination by Either Party
| | --- | ---------------------------



| | (a) | Either party shall have the right to terminate this Agreement:
| | --- | --------------------------------------------------------------



| | (i) | if the other party breaches a term of this Agreement and such breach is not cured within 10 days
after the date of written notice; or
| | --- | -------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | if the other party files an assignment in bankruptcy or a proposal under the Bankruptcy and
Insolvency Act(Canada) or if a petition in bankruptcy is filed or presented against the other party under the Bankruptcy
and Insolvency Act(Canada) or comparable legislation and such petition is not discharged within 90 days, or if a receiver
is appointed for all or substantially all of the assets or property of the other party and such appointment is not contested and
the receiver discharged within 30 days.
| | ---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



(b)          In the event of termination
by the Executive in accordance with Section 6.4(a)(i) or 6.4(a)(ii), Cynapsus shall pay to the Executive a lump sum equal to four
months plus one additional month for every full year of employment (starting from January 1, 2006) of Base Salary, to a maximum
of 14 months, and the Deemed Annual Bonus, together with all amounts which the Executive would have been entitled to during such
period and a continuation of benefits coverage during such period in respect of the elements which are permitted to be continued
in accordance with the terms of the benefit plan then in place and applicable laws.



(c)          In the event of termination
by Cynapsus in accordance with 6.4(a)(i) or 6.4(a)(ii), Cynapsus shall have no obligation to the Executive after the effective
date of termination except for payment of any Base Salary accrued to the date of termination and any other amounts which have accrued
but not yet been paid prior to the date of termination, including any amounts owing in accordance with any benefit plan. The Executive
shall not be entitled to receive any bonus in the event of termination by Cynapsus pursuant to Section 6.4(a)(i) or 6.4(a)(ii).



| | 6.5 | Change of Control
| | --- | -----------------



(a)          Upon a Change of Control
(as defined below) and for a period of nine months thereafter, in the event of termination of this Agreement by Cynapsus, or the
purchaser or other third party, as the case may be, other than for Cause, or by the Executive for Good Reason (as defined below),
Cynapsus, or the purchaser or other third party, as the case may be, shall pay to the Executive a lump sum equal to 14 months of
Base Salary and the Deemed Annual Bonus, together with all amounts which the Executive would have been entitled to during such
period and a continuation of benefits coverage during such period in respect of the elements which are permitted to be continued
in accordance with the terms of the benefit plan then in place and applicable laws.





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| | (b) | For the purposes hereof, “Change of Control” shall mean:
| | --- | --------------------------------------------------------



| | (i) | a reorganization, amalgamation or merger, or a plan of arrangement in connection with any of the
foregoing, with respect to which all or substantially all of the persons who were the beneficial owners of the then outstanding
voting shares of Cynapsus (“Shares”) immediately prior to such transaction do not, following such transaction,
beneficially own, directly or indirectly, more than 50 percent of the resulting voting shares;
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (ii) | the acquisition of Shares by a person or group of persons acting in concert as a result of which
the acquiror beneficially owns, directly or indirectly, 50 percent or more of the Shares then outstanding; or
| | ---- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (iii) | the sale to a third party of all or substantially all of the assets of Cynapsus.
| | ----- | --------------------------------------------------------------------------------



(c)          For the purposes hereof,
“Good Reason” shall mean an adverse material change to the terms and conditions of the Executive’s employment
including, but not limited to:



| | (i) | removal from, or re-assignment of, the Executive’s position as set forth in Section 1.1 without
the agreement of the Executive;
| | --- | -------------------------------------------------------------------------------------------------------------------------------



| | (ii) | a substantive change in the Executive’s duties as described in Section 1.1 without the agreement
of the Executive;
| | ---- | ------------------------------------------------------------------------------------------------------------------



| | (iii) | a change in the Executive’s reporting relationships, the result of such change not having
a reasonable remedy;
| | ----- | --------------------------------------------------------------------------------------------------------------



| | (iv) | relocation of the Executive to a location that is more than 60 kilometres from Toronto, Ontario
without the agreement of the Executive; or
| | ---- | ------------------------------------------------------------------------------------------------------------------------------------------



| | (v) | a breach by Cynapsus, or the purchaser or other third party, as the case may be, of Section 6.4(a)
hereof which is not cured or remedied within the applicable time periods set forth therein.
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------





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| | 6.6 | Termination for Death or Disability
| | --- | -----------------------------------



(a)          In the event of the
Executive’s death then this Agreement shall immediately terminate. In the event of the Disability (as hereinafter defined)
of the Executive, Cynapsus shall have the right to terminate this Agreement upon written notice given to the Executive while the
Disability is continuing which shall be effective on the date that the notice is given.



(b)          In the event of the
death or Disability of the Executive, Cynapsus shall pay to the Executive an amount equal to the Base Salary accrued to the date
of termination and the Deemed Annual Bonus, together with all amounts which have accrued but not yet been paid prior to the date
of termination, including any amounts owing in accordance with any benefit plan.



| | (c) | For the purposes hereof, “Disability” shall mean that:
| | --- | ------------------------------------------------------



| | (i) | the Executive has been and continues to be disabled as a result of illness, disease or mental or
physical disability or for other causes beyond his control such that he has been unable or unwilling or has failed to perform or
fulfil all or a material portion of his duties or the requirements of his employment hereunder on a full-time basis for:
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (A) | a period of 105 consecutive days or more, or
| | --- | --------------------------------------------



| | (B) | an aggregate of 105 days or more in any 12 month period
| | --- | -------------------------------------------------------



in the opinion of
a qualified medical practitioner who shall be satisfactory to Cynapsus, acting reasonably; or



| | (ii) | the Executive has been declared by a court of competent jurisdiction to be mentally incompetent
or incapable of managing his affairs.
| | ---- | -------------------------------------------------------------------------------------------------------------------------------------



6.7                        Upon termination
of this Agreement by either party for any reason, other than termination by Cynapsus pursuant to Section 6.1 or Section 6.4(a)(i),
the Executive shall have the right to exercise any options granted by Cynapsus in accordance with the Plan.



6.8                        Upon termination
of this Agreement by Cynapsus pursuant to Section 6.1 or Section 6.4(a)(i), any options granted by Cynapsus or any unexercised
portion thereof shall immediately terminate.





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| | 6.9 | Remedies
| | --- | --------



(a)          The parties confirm
that the provisions contained in this Article 6, including the notice and pay in lieu of notice provisions contained therein, are
valid and reasonable and are fair and equitable. The parties agree that upon any termination of the Executive’s employment
by Cynapsus, in compliance with the provisions of this Agreement, the Executive shall have no action, cause of action, claim or
demand against Cynapsus or any other person as a consequence of such termination. The Executive further acknowledges and agrees
that the payments and/or notices required pursuant to this shall be in full satisfaction of all claims for termination of his employment,
including termination pay and/or severance pay pursuant to the Employment Standards Act, 2000(Ontario) (as the same may
be amended or replaced, from time to time). Except as otherwise provided in this Article 6, the Executive shall not be entitled
to any further termination or severance payments, damages or other compensation whatsoever.



(b)          As a condition precedent
to any payment pursuant to this Article 6, the Executive agrees to deliver to Cynapsus contemporaneously with any such payment,
a full and final release of and from all actions or claims in connection therewith in favour of Cynapsus and their respective directors,
officers, employees and agents, in form and substance satisfactory to Cynapsus, acting reasonably. If the Executive is an officer
or director of Cynapsus at the relevant time of termination of his employment in accordance with the terms hereof, the Executive
agrees that contemporaneously with or as soon as is practicable after the termination of his employment hereunder for any reason
whatsoever, he will tender his resignation from any position he may hold as an officer and/or director of Cynapsus.



Article
7 - NON-DISCLOSURE, NON-SOLICITATION AND NON-COMPETITION AGREEMENT



7.1                        The Executive
has entered into a Non-Disclosure, Non-Solicitation and Non-Competition Agreement in substantially the same form entered into between
Cynapsus and its other senior officers.



7.2                        The Executive
acknowledges and agrees that the employment relationship will be governed by this Agreement and the standards and terms established
by Cynapsus’ policies as they are amended from time to time. The Executive agrees to comply with the terms of Cynapsus’
current and future policies so long as they are not inconsistent with the provisions of this Agreement. In the event Cynapsus’
policies or procedures are in conflict with this Agreement the terms of this Agreement shall prevail.



Article
8 - NEW AND ADDITIONAL CONSIDERATION



8.1                        The Executive
acknowledges and agrees that the health and insurance benefits provided to the Executive under Cynapsus’s group insurance
and benefit plan constitute new and additional consideration in favour of the Executive in connection with the execution and delivery
of this Agreement by the Executive.





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Article
9 - NOTICES



9.1                        Any notice
required or permitted to be given to the Executive shall be sufficiently given if delivered to the Executive personally or if mailed
by registered mail to the Executive’s address last known to Cynapsus or by e-mail at awilliams@cynapsus.ca.



9.2                        Any notice
required or permitted to be given to Cynapsus shall be sufficiently given if mailed by registered mail to Cynapsus’ head
office at its address last known to the Executive.



Article
10 - GENERAL



| | 10.1 | Severability
| | ---- | ------------



In the event that any provision
or part of this Agreement shall be deemed void or invalid by a court of competent jurisdiction, the remaining provisions or parts
shall be and remain in full force and effect.



| | 10.2 | Binding Effect; Assignment
| | ---- | --------------------------



This Agreement shall enure
to the benefit of, and be binding on, the parties and their respective heirs, administrators, executors, successors and permitted
assigns. Cynapsus shall have the right to assign this Agreement to any successor (whether direct or indirect, by purchase, amalgamation,
arrangement, merger, consolidation or otherwise) to all or substantially all of the business and/or assets of Cynapsus provided
that such entity assumes all obligations of Cynapsus hereunder. The Executive shall not assign or transfer, whether absolutely,
by way of security or otherwise, all or any part of the Executive's rights or obligations under this Agreement.



| | 10.3 | Entire Agreement
| | ---- | ----------------



This Agreement, together
with the Non-Disclosure, Non-Solicitation and Non-Competition Agreement dated January 1st, 2006, constitutes the entire
agreement between the parties with respect to the employment and appointment of the Executive and any and all other previous agreements,
written or oral, express or implied, between the parties or on their behalf, relating to the employment and appointment of the
Executive by Cynapsus, are terminated and cancelled and each of the parties releases and forever discharges the other of and from
all manner of actions, causes of action, claims and demands whatsoever, under or in respect of any such agreements so terminated
and cancelled.





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| | 10.4 | Modification and Waiver
| | ---- | -----------------------



Any modification to this
Agreement must be in writing and signed by the parties or it shall have no effect and shall be void. No waiver of any breach or
default hereunder shall be considered valid unless in writing, and no such waiver shall be deemed a waiver of any subsequent breach
or default of the same or similar nature.



| | 10.5 | Headings
| | ---- | --------



The headings used in this
Agreement are for convenience only and are not to be construed in any way as additions to or limitations of the covenants and agreements
contained in it.



| | 10.6 | Governing Law
| | ---- | -------------



This Agreement shall be construed
in accordance with the laws of the Province of Ontario.



| | 10.7 | Time of Essence
| | ---- | ---------------



Time shall be of the essence
of this Agreement.



| | 10.8 | Currency
| | ---- | --------



All amounts payable pursuant
to this Agreement are expressed in and shall be paid in Canadian currency.



| | 10.9 | Legal Advice
| | ---- | ------------



The Executive acknowledges
that he has had an opportunity to seek independent legal advice prior to their execution of this Agreement. The Executive acknowledges
that he has sought and obtained such independent advice, or has declined seeking such advice, despite having been given the opportunity
to do so.



| | 10.10 | Counterparts
| | ----- | ------------



This Agreement may be signed
in one or more counterparts, each of which so signed shall be deemed to be an original, and such counterparts together shall constitute
one and the same instrument. Notwithstanding the date of execution or transmission of any counterpart, each counterpart shall be
deemed to have the effective date first written above.



[Signature Page Follows]



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IN WITNESS WHEREOF this Agreement has
been executed by the parties as of the date first written above.



|SIGNED, SEALED & DELIVERED | ) |                    
|-------------------------- | - | -------------------
|in the presence of:        | ) |                    
|                           | ) |                    
|                           | ) |                    
|                           | ) |                    
|/s/ Susan Thompson         | ) | /s/ Andrew Williams
|Witness                    |   | ANDREW WILLIAMS    



| |  | CYNAPSUS THERAPEUTICS INC.
| |  | --------------------------
| |  |                           
| |  | Per:                      
| |  |                           
| |  |                           
| |  | Per:                      
| |  |                           



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SCHEDULE “A”



Additional Benefits



TheExecutive will be entitled to receive the following additional
benefits:



| | 1. | Six personal days, with pay, including sick days.
| | -- | -------------------------------------------------