EX-10.3



 Exhibit 10.3 

SEVERANCE PROTECTION AGREEMENT 

SEVERANCE PROTECTION AGREEMENT, dated July 14, 2014, by and between MediciNova, Inc., a Delaware corporation (the
“Company”), and Masatsune Okajima (the “Executive”). 
 PURPOSE 

The Board of Directors of the Company (the “Board”) recognizes that the possibility of a Change in Control (as hereinafter
defined) of the Company exists and that the threat or occurrence of a Change in Control may result in the distraction of its key management personnel because of the uncertainties inherent in such a situation. 

The Board has determined that it is essential and in the best interests of the Company and its stockholders to retain the services of the
Executive in the event of the threat or occurrence of a Change in Control and to ensure the Executive’s continued dedication and efforts in such event without undue concern for the Executive’s personal financial and employment security.

 In order to induce the Executive to remain in the employ of the Company, particularly in the event of the threat or occurrence of a
Change in Control, the Company desires to enter into this Agreement to provide the Executive with certain benefits in the event the Executive’s employment is terminated as a result of, or in connection with, a Change in Control. 

NOW, THEREFORE, in consideration of the respective agreements of the parties contained herein, it is agreed as follows: 

SECTION 1. Definitions. 

For purposes of this Agreement, the following terms have the meanings set forth below: 

“Accrued Compensation” means an amount which includes all amounts earned or accrued by the Executive through and
including the Termination Date but not paid to the Executive on or prior to such date, including (a) all base salary, (b) reimbursement for all reasonable and necessary expenses incurred by the Executive on behalf of the Company during the
period ending on the Termination Date, (c) all vacation pay and (d) all bonuses and incentive compensation (other than the Pro Rata Bonus). 

“Base Salary Amount” means the greater of the Executive’s annual base salary (a) at the rate in effect on
the Termination Date and (b) at the highest rate in effect at any time during the 180-day period prior to a Change in Control, and will include all amounts of the Executive’s base salary that are deferred under any qualified or
non-qualified employee benefit plan of the Company or any other agreement or arrangement. 
 “Beneficial Owner” has
the meaning as used in Rule 13d-3 promulgated under the Securities Exchange Act. The terms “Beneficially Owned” and “Beneficial Ownership” each have a correlative meaning. 

“Board” means the Board of Directors of the Company. 

“Bonus Amount” means the greatest of (a) the annual bonus paid or payable to the Executive pursuant to any annual
bonus or incentive plan maintained by the Company in respect of the fiscal year ending immediately prior to the fiscal year in which the Termination Date occurs, (b) the average of the annual bonus paid or payable to the Executive pursuant to
any annual bonus or incentive plan maintained by the Company in respect of each of the three fiscal years ending immediately prior to the fiscal year in which the Termination Date occurs (or, if higher, ending in respect of each of the three fiscal
years ending immediately prior to the fiscal year in which the Change in Control occurs) or (c) in the event that the Executive was not employed by the Company for the entire fiscal year ending immediately prior to the fiscal year in which the
Termination Date occurs, the annual target bonus established and payable to the Executive pursuant to any annual bonus or incentive plan maintained by the Company in respect of the fiscal year ending immediately prior to the fiscal year in which the
Termination Date occurs. Bonus Amount includes only the short-term incentive portion of the annual bonus and does not include restricted stock awards, options or other long-term incentive compensation awarded to the Executive. 

“Cause” for the termination of the Executive’s employment with the Company will be deemed to exist if
(a) the Executive has been convicted for committing an act of fraud, embezzlement, theft or other act constituting a 







 
felony (other than traffic related offenses or as a result of vicarious liability), (b) the Executive willfully engages in illegal conduct or gross misconduct that is significantly injurious
to the Company; however, no act or failure to act on the Executive’s part shall be considered “willful” unless done or omitted to be done by the Executive not in good faith and without reasonable belief that his or her action or
omission was in the best interest of the Company or (c) failure to perform his or her duties in a reasonably satisfactory manner after the receipt of a notice from the Company detailing such failure if the failure is incapable of cure, and if
the failure is capable of cure, upon the failure to cure such failure within 30 days of such notice or upon its recurrence. 

“Change in Control” of the Company means, and shall be deemed to have occurred upon, any of the following events: 

(a) The acquisition by any Person of beneficial ownership (as defined in Rule 13d-3 of the General Rules and Regulations under the Securities
Exchange Act) of forty percent (40%) or more of the outstanding voting securities; provided, however, that the following acquisitions shall not constitute a Change in Control for purposes of this subparagraph (a): (A) any acquisition
directly from the Company; (B) any acquisition by the Company or any of its Subsidiaries; (C) any acquisition by any employee benefit plan (or related trust) sponsored or maintained by the Company or any of its Subsidiaries; or
(D) any acquisition by any corporation pursuant to a transaction which complies with clauses (i), (ii) and (iii) of subparagraph (c) below; or 

(b) Individuals who, as of January1, 2014, constitute the Board (the “Incumbent Board”) cease for any reason to constitute at
least a majority of the Board; provided, however, that any individual who becomes a director of the Company subsequent to January 1, 2014, and whose election, or whose nomination for election by the Company’s stockholders, to the Board was
either (i) approved by a vote of at least a majority of the directors then comprising the Incumbent Board or (ii) recommended by a nominating committee comprised entirely of directors who are then Incumbent Board members shall be
considered as though such individual were a member of the Incumbent Board, but excluding, for this purpose, any such individual whose initial assumption of office occurs as a result of either an actual or threatened election contest (as such terms
are used in Rule 14a-11 of Regulation 14A promulgated under the Securities Exchange Act), other actual or threatened solicitation of proxies or consents or an actual or threatened tender offer; or 

(c) Consummation of a reorganization, merger, or consolidation or sale or other disposition of all or substantially all of the assets of the
Company (a “Business Combination”), in each case unless following such Business Combination, (i) all or substantially all of the Persons who were the Beneficial Owners, respectively, of the outstanding shares and outstanding voting
securities immediately prior to such Business Combination own, directly or indirectly, more than fifty percent (50%) of the combined voting power of the then outstanding voting securities entitled to vote generally in the election of directors
of the Company, as the case may be, of the entity resulting from the Business Combination (including, without limitation, an entity which as a result of such transaction owns the Company or all or substantially all of the Company’s assets
either directly or through one or more subsidiaries) in substantially the same proportions as their ownership, immediately prior to such Business Combination, of the outstanding voting securities (provided, however, that for purposes of this clause
(i) any shares of common stock or voting securities of such resulting entity received by such Beneficial Owners in such Business Combination other than as the result of such Beneficial Owners’ ownership of outstanding shares or outstanding
voting securities immediately prior to such Business Combination shall not be considered to be owned by such Beneficial Owners for the purposes of calculating their percentage of ownership of the outstanding common stock and voting power of the
resulting entity); (ii) no Person (excluding any entity resulting from such Business Combination or any employee benefit plan (or related trust) of the Company or such entity resulting from the Business Combination) beneficially owns, directly
or indirectly, forty percent (40%) or more of the combined voting power of the then outstanding voting securities of such entity resulting from the Business Combination unless such Person owned forty percent (40%) or more of the
outstanding shares or outstanding voting securities immediately prior to the Business Combination; and (iii) at least a majority of the members of the Board of the entity resulting from such Business Combination were members of the Incumbent
Board at the time of the execution of the initial agreement, or the action of the Board, providing for such Business Combination; or 
 (d)
Approval by the Company’s stockholders of a complete liquidation or dissolution of the Company. 
 For purposes of clause (c), any
Person who acquires outstanding voting securities of the entity resulting from the Business Combination by virtue of ownership, prior to such Business Combination, of outstanding voting securities of both the Company and the entity or entities with
which the Company is combined shall be treated as two Persons after the Business Combination, who shall be treated as owning outstanding voting securities of the entity resulting from the Business Combination by virtue of ownership, prior to such
Business Combination of, respectively, outstanding voting securities of the Company, and of the entity or entities with which the Company is combined. 

  
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 “Code” means the Internal Revenue Code of 1986, as amended. 

“COBRA” means the Consolidated Omnibus Budget Reconciliation Act of 1985, as amended. 

“Company” means MEDICINOVA, INC., a Delaware corporation, provided that in recognition of the fact that the Executive
may be employed by a direct or indirect Subsidiary of MEDICINOVA, INC., the term “Company” when referring to the employment relationship and the compensation or benefits related thereto shall include the employer of Executive as the
context requires. 
 “Continuation Period” has the meaning set forth in Section 3.1(b)(iii). 

“Disability” means the status of disability determined conclusively by the Company based upon certification of
disability by the Social Security Administration or upon such other proof as the Company may reasonably require, effective upon receipt of such certification or other proof by the Company. 

“Full Release” means a written release, timely executed so that it is fully effective no later than 60 days following
the Executive’s Termination Date, in a form satisfactory to the Company and counsel pursuant to which the Executive fully and completely releases the Company from any and all claims that the Executive may have against the Company or its
affiliates (other than any claims that may or have arisen under this Agreement). 
 “Good Reason” means the
occurrence of any of the events or conditions described in clauses (a) through (e) hereof, without the Executive’s prior written consent: 

(a)(i) any material adverse change in the Executive’s status, position or responsibilities (including reporting responsibilities) from
the Executive’s status, position or responsibilities as in effect at any time within 180 days preceding the date of the Change in Control or at any time thereafter, or (ii) any assignment to the Executive of duties or responsibilities
which are materially and adversely inconsistent with the Executive’s status, position or responsibilities as in effect at any time within 180 days preceding the date of the Change in Control or at any time thereafter, in each case except in
connection with the termination of the Executive’s employment for Disability, Cause, as a result of the Executive’s death or by the Executive other than for Good Reason; 

(b) a material reduction in Executive’s base salary; 

(c) the imposition of a requirement that the Executive be based at any place outside a 50-mile radius from the Executive’s principal
place of employment immediately prior to the Change in Control, except for reasonably required travel on Company business which is not materially greater in frequency or duration than prior to the Change in Control; 

(d) any material breach by the Company of any provision of this Agreement or any other agreement to which the Company and the Executive are
parties; or 
 (e) the failure of the Company to obtain, as contemplated in Section 7, an agreement, reasonably satisfactory to the
Executive, from any Successor to assume and agree to perform this Agreement. 
 Notwithstanding anything to the contrary in this Agreement,
no termination will be deemed to be for Good Reason hereunder if it is remedied by the Company within 30 days after receipt of notice thereof given by the Executive. 

“Notice of Termination” means a written notice from the Company or the Executive of the termination of the
Executive’s employment which indicates the specific termination provision in this Agreement relied upon and which sets forth in reasonable detail the facts and circumstances claimed to provide a basis for termination of the Executive’s
employment under the provision so indicated. Any such notice given by Executive of a termination for Good Reason shall be given within 90 days of the occurrence giving rise to such termination for Good Reason. 

“Person” has the meaning as defined in Section 3(a)(9) of the Securities Exchange Act and used in
Section 13(d) or 14(d) of the Securities Exchange Act, and will include any “group” as such term is used in such sections. 

  
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 “Pro Rata Bonus” means an amount equal to the Bonus Amount multiplied by
a fraction, the numerator of which is the number of days elapsed in the then fiscal year through and including the Termination Date and the denominator of which is 365. 

“Securities Exchange Act” means the Securities Exchange Act of 1934, as amended. 

“Subsidiary” means any corporation with respect to which another specified corporation has the power under ordinary
circumstances to vote or direct the voting of sufficient securities to elect a majority of the directors. 

“Successor” means a corporation or other entity acquiring all or substantially all the assets and business of the
Company, whether by operation of law, by assignment or otherwise. 
 “Termination Date” means (a) in the case
of the Executive’s death, the Executive’s date of death, (b) in the case of the termination of the Executive’s employment with the Company by the Executive for Good Reason, five days after the date the Notice of Termination is
received by the Company, and (c) in all other cases, the date specified in the Notice of Termination; provided that if the Executive’s employment is terminated by the Company for Cause or due to Disability, the date specified in the Notice
of Termination will be at least 30 days after the date the Notice of Termination is given to the Executive. 
 SECTION 2. Term of
Agreement. 
 The term of this Agreement (the “Term”) will commence on the date of this Agreement, and will
continue in effect until December 31, 2014; provided that on December 31, 2014 and each anniversary of such date thereafter, the Term shall automatically be extended for one additional year unless, not later than October 1 immediately
preceding such automatic extension, the Company or the Executive shall have given notice not to extend the Term; and further provided that in the event a Change in Control occurs during the Term, the Term will be extended to the date 24 months after
the date of the occurrence of such Change in Control. 
 Notwithstanding the foregoing and subject to Section 3.2, the Term shall be
deemed to have immediately expired without any further action and this Agreement will immediately terminate and be of no further effect if any of the following events occurs prior to a Change in Control: 

(a) the Executive’s employment with the Company is terminated (whether by the Company or the Executive) for any reason; 

(b) the Executive’s employment is not terminated but there is a change in his or her status, position or responsibilities (including
reporting responsibilities) from that which applied to Executive on the date of this Agreement; or 
 (c) the Executive reaches the
mandatory retirement age applicable to the Company’s executive officers under any stated policy of the Company, as may be adopted and revised from time to time by the Board. 

SECTION 3. Termination of Employment. 

3.1 If, during the Term, the Executive’s employment with the Company is terminated within 12 months following a Change in Control, the
Executive will be entitled to the following compensation and benefits: 
 (a) If Executive’s employment with the Company is terminated
(i) by the Company for Cause or Disability, (ii) by reason of the Executive’s death or (iii) by the Executive other than for Good Reason, the Company will pay to the Executive the Accrued Compensation and, if such termination is
other than by the Company for Cause, a Pro Rata Bonus, such amount will be paid in a single lump sum cash payment by the Company to the Executive within five days after the Termination Date. 

(b) If the Executive’s employment with the Company is terminated (whether by the Company or the Executive) for any reason other than as
specified in Section 3.1(a), the Executive will be entitled to the following: 
 (i) the Company will pay the Executive all Accrued
Compensation and a Pro Rata Bonus, such amounts will be paid in a single lump sum cash payment by the Company to the Executive within five days after the Termination Date; 

  
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 (ii) subject to Section 18, if applicable, and subject to the Executive providing the
Company with (and not revoking) a Full Release (taking into account any applicable period for revocation), the Company will pay the Executive as severance pay, and in lieu of any further compensation for periods subsequent to the Termination Date,
in a single payment an amount in cash equal to: 
 (i) two (2) times the sum of (A) the Base Salary Amount and (B) the Bonus
Amount, plus 
 (ii) the estimated premium cost to the Company of the provision of continued life insurance and disability benefits for the
Executive for 18 months following the Termination Date, as determined by the Company in its sole discretion, 
 which amount will be paid in
a single lump sum cash payment by the Company to the Executive on the 60th day following the Termination Date; 
 (iii) subject to
Section 18, if applicable, and subject to the Executive providing the Company with (and not revoking) a Full Release (taking into account any applicable period for revocation), and complying with his or her obligations under Section 6, the
Company will pay the cost of medical, dental and vision continuation coverage under COBRA for the Executive and any eligible dependents that were covered under the Company’s health care plans immediately prior to the Termination Date, for a
period of up to 18 months following the Termination Date (the “Continuation Period”), subject to the Executive’s timely election and continuation of such coverage (the “COBRA Benefit”). Notwithstanding the
foregoing, if the Company determines, in its sole discretion, that it cannot provide the COBRA Benefit without a substantial risk of violating applicable law (including the Patient Protection and Affordable Care Act), the Company instead shall pay
to the Executive, on the first day of each calendar month, a fully taxable cash payment equal to the applicable COBRA premiums for that month (including premiums for the Executive and the Executive’s eligible dependents who have elected and
remain enrolled in such COBRA coverage), subject to applicable tax withholdings (such amount, the “Special Cash Payment”), for the remainder of the Continuation Period. Executive may, but is not obligated to, use such Special Cash
Payments toward the cost of COBRA premiums. This Section 3.1(b)(iii) will not be interpreted so as to limit any benefits to which the Executive or the Executive’s dependents or beneficiaries may be entitled under any of the Company’s
employee benefit plans, programs or practices following the Executive’s termination of employment; 
 (iv) the Company shall provide
the Executive with reasonable outplacement services suitable to the Executive’s position for a period of 12 months or, if earlier, until the first acceptance by the Executive of an offer of employment; and 

(v) such other acceleration of vesting and other benefits provided in other Company plans or agreements regarding options to purchase Company
stock, restricted stock, deferral of stock or other equity compensation awards granted to or otherwise applicable to Executive. 
 (c) To
the extent necessary to comply with Code Section 409A, any such payment, reimbursements or in-kind benefits to be paid or provided to the Executive under Section 3.1(b)(iii) and/or Section 3.1(b)(iv), shall be paid or provided as soon
as practical following submission by the Executive of a reimbursement request but no later than the end of the calendar year following the calendar year in which such cost is incurred and no benefit will be paid or provided if the Executive incurs
such cost after the end of the second calendar year following the calendar year in which the Termination Date occurs. 
 (d) The Executive
will not be required to mitigate the amount of any payment provided for in this Agreement by seeking other employment or otherwise, and no such payment will be offset or reduced by the amount of any compensation or benefits provided to the Executive
in any subsequent employment, except as specifically provided in Section 3.1(b)(iii) and 3.1(b)(iv). 
 3.2 Notwithstanding anything in
this Agreement to the contrary, if, within the 30 days immediately preceding a Change in Control, (i) the Executive’s employment is terminated (whether by the Company or the Executive) for any reason other than as specified in
Section 3.1(a), or (ii) (A) there is a material adverse change in the Executive’s status, position or responsibilities (including reporting responsibilities) from that which applied to Executive on the date of this Agreement, and
(B) the Executive’s employment with the Company is subsequently terminated within 24 months following a Change in Control (whether by the Company or the Executive) for any reason other than as specified in Section 3.1(a), the
Executive shall be entitled to receive the benefits provided in Section 3.1(b). 

  
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 3.3 Except as otherwise noted herein, the compensation to be paid to the Executive pursuant to
Sections 3.1(a), 3.1(b)(i) and 3.1(b)(ii) of this Agreement (whether by reason of Section 3.1(a), Section 3.1(b) or Section 3.2) will be in lieu of any similar severance or termination compensation (i.e., compensation based
directly on the Executive’s annual salary or annual salary and bonus) to which the Executive may be entitled under any other Company severance or termination agreement, plan, program, policy, practice or arrangement. 

SECTION 4. Notice of Termination. 

Following a Change in Control, any purported termination of the Executive’s employment by the Company will be communicated by a Notice of
Termination to the Executive. For purposes of this Agreement, no such purported termination will be effective without such Notice of Termination. 

SECTION 5. Excise Tax Adjustments. 

5.1 In the event Executive becomes entitled to receive the benefits provided pursuant to Sections 3.1(b) or 3.2 herein, and the Company
determines that such benefits (the “Total Payments”) will be subject to the tax (the “Excise Tax”) imposed by Section 4999 of the Code, or any similar tax that may hereafter be imposed, the Company shall
compute the “Net After-Tax Amount,” and the “Reduced Amount,” and shall adjust the Total Payments as described below. The Net After-Tax Amount shall mean the present value of all amounts payable to the Executive
hereunder, net of all federal income, excise and employment taxes imposed on the Executive by reason of such payments. The Reduced Amount shall mean the largest aggregate amount of the Total Payments that if paid to the Executive would result in the
Executive receiving a Net After-Tax Amount that is equal to or greater than the Net After-Tax Amount that the Executive would have received if the Total Payments had been made. If the Company determines that there is a Reduced Amount, the Total
Payments will be reduced to the Reduced Amount. With respect to any such reduction, payments and benefits will be reduced in the following order: first against the latest scheduled cash payments (if necessary, to zero), then against any current cash
payments and benefits (if necessary, to zero), then against any equity or equity derivative payments and benefits (if necessary, to zero) and then to non-cash payments and benefits (other than equity or equity derivative related payments). 

5.2 For purposes of determining whether the Total Payments will be subject to the Excise Tax and the amounts of such Excise Tax and for
purposes of determining the Reduced Amount and the Net After-Tax Amount: 
 (a) Any other payments or benefits received or to be received by
the Executive in connection with a Change in Control of the Company or the Executive’s termination of employment (whether pursuant to the terms of this Agreement or any other plan, arrangement, or agreement with the Company, or with any
individual, entity, or group of individuals or entities (individually and collectively referred to in this subsection (a) as “Persons”) whose actions result in a change in control of the Company or any Person affiliated with
the Company or such Persons) shall be treated as “parachute payments” within the meaning of Section 280G(b)(2) of the Code, and all “excess parachute payments” within the meaning of Section 280G(b)(1) of
the Code shall be treated as subject to the Excise Tax, unless in the opinion of a tax advisor selected by the Company and reasonably acceptable to the Executive (“Tax Counsel”), such other payments or benefits (in whole or in part)
should be treated by the courts as representing reasonable compensation for services actually rendered (within the meaning of Section 280G(b)(4)(B) of the Code), or otherwise not subject to the Excise Tax; 

(b) The amount of the Total Payments that shall be treated as subject to the Excise Tax shall be equal to the lesser of (i) the total
amount of the Total Payments; or (ii) the amount of excess parachute payments within the meaning of Section 280G(b)(1) of the Code (after applying clause (a) above); 

(c) In the event that the Executive disputes any calculation or determination made by the Company, the matter shall be determined by Tax
Counsel, the fees and expenses of which shall be borne solely by the Company; and 
 (d) The Executive shall be deemed to pay federal income
taxes at the highest marginal rate of federal income taxation in the calendar year in which the Total Payments are to be made or commenced, as applicable, and state and local income taxes at the highest marginal rate of taxation in the state and
locality of the Executive’s residence on the effective date of employment, net of the maximum reduction in federal income taxes which could be obtained from deduction of such state and local taxes, taking into account the reduction in itemized
deduction under Section 68 of the Code. 

  
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 SECTION 6. Covenants of the Executive. 

During the Continuation Period following any Change in Control pursuant to which the Executive receives the benefits pursuant to
Section 3.1(b)(iii), the Executive covenants and agrees as follows: 
 (a) the Executive agrees to comply with his or her obligations
under the any Inventions, Copyright and Confidentiality Agreement that he or she entered into with the Company; and 
 (b) the Executive
acknowledges that the Executive has knowledge of confidential and proprietary information concerning the current salary, benefits, skills, and capabilities of Company employees and that it would be improper for the Executive to use such Company
proprietary information in any manner adverse to the Company’s interests. The Executive agrees that he or she will not recruit or solicit for employment, directly or indirectly, any employee of the Company during the Continuation Period. 

SECTION 7. Successors; Binding Agreement. 

This Agreement will be binding upon and will inure to the benefit of the Company and its Successors, and the Company will require any
Successors to expressly assume and agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform it if no such succession or assignment had taken place. Neither this Agreement nor any right
or interest hereunder will be assignable or transferable by the Executive or by the Executive’s beneficiaries or legal representatives, except by will or by the laws of descent and distribution. This Agreement will inure to the benefit of and
be enforceable by the Executive’s legal representatives. 
 SECTION 8. Fees and Expenses. 

The Company will pay as they become due all legal fees and related expenses (including the costs of experts) incurred by the Executive, in good
faith, in (a) contesting or disputing, any such termination of employment and (b) seeking to obtain or enforce any right or benefit provided by this Agreement or by any other plan or arrangement maintained by the Company under which the
Executive is or may be entitled to receive benefits. Any such reimbursements under this Section 8 shall be made as soon as practicable following submission of a reimbursement request, but no later than the end of the year following the year
during which the underlying expense was incurred. If the dispute is resolved by a final decision of an arbitrator pursuant to Section 15 in the favor of the Company, the Executive shall reimburse the Company for all such legal fees and related
expenses (including costs of experts) paid by the Company on behalf of the Executive. 
 SECTION 9. Notice. 

For the purposes of this Agreement, notices and all other communications provided for in the Agreement (including the Notice of Termination)
will be in writing and will be deemed to have been duly given when personally delivered or sent by certified mail, return receipt requested, postage prepaid, addressed to the respective addresses last given by each party to the other, provided that
all notices to the Company will be directed to the attention of the Board with a copy to the Secretary of the Company. All notices and communications will be deemed to have been received on the date of delivery thereof or on the third business day
after the mailing thereof, except that notice of change of address will be effective only upon receipt. 
 SECTION 10. Dispute Concerning
Termination. 
 If prior to the Date of Termination (as determined without regard to this Section 10), the party
receiving the Notice of Termination notifies the other party that a dispute exists concerning the termination, the Date of Termination shall be extended until the earlier of (i) the date on which the Term ends or (ii) the date on which the
dispute is finally resolved, either by mutual written agreement of the parties or by a final judgment, order or decree of an arbitrator or a court of competent jurisdiction (which is not appealable or with respect to which the time for appeal
therefrom has expired and no appeal has been perfected); provided, however, that the Date of Termination shall be extended by a notice of dispute given by the Executive only if such notice is given in good faith and the Executive pursues the
resolution of such dispute with reasonable diligence. 
 SECTION 11. Compensation During Dispute. 

If a purported termination occurs following a Change in Control and during the Term and the Date of Termination is extended in accordance with
Section 10 hereof, the Company shall continue to pay the Executive the full compensation in effect when the notice giving rise to the dispute was given (including, but not limited to, salary) and continue the Executive as a participant in all
compensation, benefit and insurance plans in which the Executive 

  
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was participating when the Notice of Termination was given, until the Date of Termination, as determined in accordance with Section 10 hereof. Amounts paid under this Section 11 are in
addition to all other amounts due under this Agreement and shall not be offset against or reduce any other amounts due under this Agreement or otherwise. 

SECTION 12. Nonexclusivity of Rights. 

Nothing in this Agreement will prevent or limit the Executive’s continuing or future participation in any benefit, bonus, incentive or
other plan or program provided by the Company for which the Executive may qualify, nor will anything herein limit or reduce such rights as the Executive may have under any other agreements with the Company (except for any severance or termination
provision included in any Employment Agreement covering the Executive, which in circumstances under which amounts become payable under Section 3.1(b) hereof shall be deemed superseded completely by this Agreement and of no further force and
effect). Amounts which are vested benefits or which the Executive is otherwise entitled to receive under any plan or program of the Company will be payable in accordance with such plan or program, except as specifically modified by this Agreement.

 SECTION 13. No Set-Off. 

The Company’s obligation to make the payments provided for in this Agreement and otherwise to perform its obligations hereunder will not
be affected by any circumstances, including any right of set-off, counterclaim, recoupment, defense or other right which the Company may have against the Executive or others. 

SECTION 14. Miscellaneous. 

No provision of this Agreement may be modified, waived or discharged unless such waiver, modification or discharge is agreed to in writing and
signed by the Executive and the Company. No waiver by either party hereto at any time of any breach by the other party hereto of, or compliance with, any condition or provision of this Agreement to be performed by such other party will be deemed a
waiver of similar or dissimilar provisions or conditions at the same or at any prior or subsequent time. No agreement or representation, oral or otherwise, express or implied, with respect to the subject matter hereof has been made by either party
which is not expressly set forth in this Agreement. 
 SECTION 15. Governing Law and Binding Arbitration. 

This Agreement will be governed by and construed and enforced in accordance with the laws of the State of Delaware without giving effect to the
conflict of laws principles thereof. All disputes relating to this Agreement, including its enforceability, shall be resolved by final and binding arbitration before an arbitrator appointed by the Judicial Arbitration and Mediation Service
(JAMS), with the arbitration to be held in San Diego, California. Judgment upon the award may be entered in any court having jurisdiction thereof. 

SECTION 16. Severability. 

The provisions of this Agreement will be deemed severable and the invalidity or unenforceability of any provision will not affect the validity
or enforceability of the other provisions hereof. 
 SECTION 17. Entire Agreement. 

This Agreement constitutes the entire agreement between the parties hereto and supersedes all prior agreements, if any, understandings and
arrangements, oral or written, between the parties hereto with respect to severance protection in connection with a Change in Control. 
 SECTION
18. Section 409A. 
 18.1 Notwithstanding any provision to the contrary in this Agreement, the Company shall
delay the commencement of payments or benefits coverage to which the Executive would otherwise become entitled under the Agreement in connection with his or her termination of employment until the earlier of (i) the expiration of the six-month
period measured from the date of the Executive’s “separation from service” with the Company (as such term is defined in Treasury Regulations issued under Section 409A of the Code) or (ii) the date of the
Executive’s death, if and only if the Company in good faith determines that the Executive is a “specified employee” within the meaning of that term under Code Section 409A(a)(2)(B) at the time of such separation from
service and that such delayed commencement is otherwise required in order to avoid a prohibited distribution under Section 409A(a)(2) of 

  
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the Code. Upon the expiration of the applicable Code Section 409A(a)(2) deferral period, all payments and benefits deferred pursuant to this Section 18 (whether they would have
otherwise been payable in a single sum or in installments in the absence of such deferral) shall be paid or reimbursed to the Executive in a lump sum with interest at the prime rate as published in The Wall Street Journal on the first
business day following the end of the deferral period, and any remaining payments and benefits due under the Agreement shall be paid or provided in accordance with the normal payment dates specified for them herein. 

18.2 The provisions of this Agreement which require commencement of payments or benefits coverage subject to Section 409A upon a
termination of employment shall be interpreted to require that the Executive have a “separation from service” with the Company (as such term is defined in Treasury Regulations issued under Code Section 409A). 

18.3 With regard to any provision herein that provides for the reimbursement of costs and expenses or in-kind benefits, except as permitted by
Code Section 409A, (i) the right to reimbursement or in-kind benefits shall not be subject to liquidation or exchange for another benefit, (ii) the amount of expense eligible for reimbursement, or in-kind benefits, provided during any
taxable year shall not affect the expenses eligible for reimbursement, or in-kind benefits to be provided, in any other taxable year, provided that the foregoing clause (ii) shall not be violated with regard to expenses reimbursed under
any arrangement covered by Section 105(b) of the Code solely because such expenses are subject to a limit related to the period the arrangement is in effect and (iii) such payments shall be paid or provided as soon as practical following
submission by the Executive of a reimbursement request but no later than the end of the calendar year following the calendar year in which such expense is incurred. 

18.4 For purposes of Code Section 409A, Executive’s right to receive any installment payments pursuant to this Agreement shall be
treated as a right to receive a series of separate and distinct payments. In no event may Executive, directly or indirectly, designate the calendar year of any payment to be made under this Agreement that is considered nonqualified deferred
compensation. 
 18.5 The provisions of this Section 18 are intended to assure that any benefits provided to Executive hereunder shall
comply with Code Section 409A and this Agreement shall be interpreted consistent with such section in all respects. 
 IN WITNESS
WHEREOF, the undersigned have executed the above agreement as of the date set forth first above. 
  

							
	 MEDICINOVA, INC.,

A Delaware Corporation
	  		  	EXECUTIVE
				
	By:	  	 /s/ Yuichi Iwaki
	  		  	 /s/ Masatsune Okajima

	Name:	  	Yuichi Iwaki	  		  	Masatsune Okajima
	Title:	  	President and CEO	  		  	


  
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