Exhibit 10.1

NEITHER THIS DEBENTURE NOR THE SECURITIES INTO WHICH THIS DEBENTURE IS CONVERTIBLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE. THESE SECURITIES HAVE BEEN SOLD IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH APPLICABLE STATE SECURITIES LAWS.

SCILEX HOLDING COMPANY

CONVERTIBLE DEBENTURE

Principal Amount: $7,500,000

Debenture Issuance Date: April 20, 2023

Debenture Number: SCLX-3

FOR VALUE RECEIVED, SCILEX HOLDING COMPANY, an entity organized under the laws of Delaware (the “Company”), hereby promises to pay to the order of YA II PN, Ltd., or its registered assigns (the “Holder”) the amount set out above as the principal amount (as reduced pursuant to the terms hereof pursuant to redemption, conversion or otherwise, the “Principal”) when due, whether upon the Maturity Date (as defined below), acceleration, redemption or otherwise (in each case in accordance with the terms hereof) and to pay interest (“Interest”) on any outstanding Principal at the applicable Interest Rate from the date set out above as the Debenture Issuance Date (the “Issuance Date”) until the same becomes due and payable, whether upon the Maturity Date or acceleration, conversion, redemption or otherwise (in each case in accordance with the terms hereof). This Convertible Debenture (including all debentures issued in exchange, transfer or replacement hereof, this “Debenture”) was originally issued pursuant to the Securities Purchase Agreement dated as of March 21, 2023 (the “Agreement Date”), as it may be amended from time to time (the “Securities Purchase Agreement”) between the Company and the buyers listed on the Schedule of Buyers attached thereto. Certain capitalized terms used herein are defined in Section (15).

(1) GENERAL TERMS

(a) Maturity Date. On the Maturity Date, the Company shall pay to the Holder an amount in cash representing all outstanding Principal, accrued and unpaid Interest, and any other amounts outstanding pursuant to the terms of this Debenture. The “Maturity Date” shall be December 21, 2023, as may be extended at the option of the Holder. Other than as specifically permitted by this Debenture, the Company may not prepay or redeem any portion of the outstanding Principal and accrued and unpaid Interest.

(b) Interest Rate and Payment of Interest. Interest shall accrue on the outstanding Principal balance hereof at an annual rate equal to 7.00% (“Interest Rate”), which Interest Rate shall increase to an annual rate of 15% upon the occurrence and during the continuance of any Event of Default. Interest shall be calculated based on a 365-day year and the actual number of days elapsed, to the extent permitted by applicable law.

(c) Payment Dates. Whenever any payment or other obligation hereunder shall be due on a day other than a Business Day, such payment shall be made on the next succeeding Business Day.

(2) PAYMENTS

(a) Installment Payments. On or before each date (each, an “Installment Date”) set forth on the repayment schedule attached as Exhibit I hereto (the “Repayment Schedule”), the Company shall repay a portion of the outstanding balance of this Debenture in an amount equal to the Principal amount set forth on the Repayment Schedule as of such Repayment Date, plus accrued and unpaid Interest outstanding on this Debenture, plus, solely in the case of a cash payment in accordance with (i) of this Section 2(a), a payment premium equal to 5% in respect of the Principal amount of such payment (collectively, the “Installment Amount”), provided that, for the avoidance of doubt, the payment premium equal to 5% shall not apply in respect to any Installment Amount that is paid directly from an advance from the Yorkville SEPA. With respect to the payment of any Installment Amount by the Company hereunder, the Company shall, at its own option, repay each Installment Amount either (i) in cash on or before the Installment Date, or (ii) by submitting an Advance Notice (as defined in the Yorkville SEPA) (an “Advance Repayment”), or a series of Advance Notices, each with an Advance Date (as defined in the Yorkville SEPA) on or before the applicable Instalment Date, or any combination of (i) or (ii) as determined by the Company. In respect of any Installment Amount, or portion thereof, to be repaid by the Company in accordance with (i) of this Section 2(a), the Company shall pay to the Holder such Installment Amount to the Holder by wire transfer of immediately available funds in cash on or before such Installment Date. If the Company elects (or is deemed to have elected, as set forth below) an Advance Repayment in accordance with (ii) of this Section 2(a), for all or a portion of an Installment Amount, then the Company shall deliver an Advance Notice to the Holder in accordance with the terms and conditions of the Yorkville SEPA, that will have an Advance Date on or before the applicable Installment Date. Upon the closing of such Advance Notice in accordance with Section 2.02 of the Yorkville SEPA, the Holder shall offset the amount due to be paid by the Holder to the Company under the Yorkville SEPA against an equal amount of the Installment Amount to be paid by the Advance Repayment. If, on the Installment Date any portion of the Installment Amount remains unpaid, the Company shall repay such outstanding Payment Amount as a cash repayment pursuant to (i) of this Section 2(a). Any acceleration of the Repayment Schedule shall only be upon mutual consent. Any conversions made by the Holder prior to an Installment Date shall have the effect of reducing the amount due on any future Installment Date in chronological order by the amount of such conversion.

If the Company delivers an Advance Notice to the Holder 30 days or less prior to the next Installment Date (except in respect to the first Installment Date, 60 days) then the Company shall be deemed to have elected an Advance Repayment in respect of such Advance Notice up to the Installment Amount due on such next Installment Date.

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(b) Optional Redemption. The Company at its option and in its sole discretion shall have the right, but not the obligation, to redeem (“Optional Redemption”) early a portion or all amounts outstanding under this Debenture as described in this Section; provided that (i) the trading price of the Common Stock is less than the Conversion Price at the time of the Redemption Notice (as defined below) and (ii) the Company provides the Holder with at least five (5) Business Days’ prior written notice (each, a “Redemption Notice”) of its desire to exercise an Optional Redemption. Each Redemption Notice shall be irrevocable and shall specify the outstanding balance of the Convertible Debentures to be redeemed and the applicable Redemption Premium. The “Redemption Amount” shall be equal to the outstanding Principal balance being redeemed by the Company, plus the Redemption Premium, plus all accrued and unpaid interest in respect of such Principal amount. After receipt of the Redemption Notice, the Holder shall have five (5) Business Days to elect to convert all or any portion of the Debenture. On the sixth (6^th) Business Day after the Redemption Notice, the Company shall deliver to the Holder the Redemption Amount with respect to the Principal amount redeemed after giving effect to conversions effected during the five (5) Business Day period.

(3) EVENTS OF DEFAULT.

(a) An “Event of Default”, wherever used herein, means any one of the following events (whatever the reason and whether it shall be voluntary or involuntary or effected by operation of law or pursuant to any judgment, decree or order of any court, or any order, rule or regulation of any administrative or governmental body):

(i) the Company’s failure to pay to the Holder any amount of Principal, Interest, or other amounts when and as due under this Debenture or any other Transaction Document (as defined in Section (15)) (a “Payment Default”) within five (5) Business Days after such payment is due;

(ii) The Company or any Subsidiary of the Company shall commence, or there shall be commenced against the Company or any Subsidiary of the Company under any applicable bankruptcy or insolvency laws as now or hereafter in effect or any successor thereto, or the Company or any Subsidiary of the Company commences any other proceeding under any reorganization, arrangement, adjustment of debt, relief of debtors, dissolution, insolvency or liquidation or similar law of any jurisdiction whether now or hereafter in effect relating to the Company or any Subsidiary of the Company any such bankruptcy, insolvency or other proceeding which remains undismissed for a period of sixty one (61) days; or the Company or any Subsidiary of the Company is adjudicated insolvent or bankrupt; or any order of relief or other order approving any such case or proceeding is entered; or the Company or any Subsidiary of the Company suffers any appointment of any custodian, private or court appointed receiver or the like for it or all or substantially all of its property which continues undischarged or unstayed for a period of sixty one (61) days; or the Company or any Subsidiary of the Company makes a general assignment of all or substantially all of its assets for the benefit of creditors; or the Company or any Subsidiary of the Company shall fail to pay, or shall state that it is unable to pay, or shall be unable to pay, its debts generally as they become due; or the Company or any Subsidiary of the Company shall call a meeting of its creditors with a view to arranging a composition, adjustment or restructuring of its debts; or the Company or any Subsidiary of the Company shall by any act or failure to act expressly indicate its consent to, approval of or acquiescence in any of

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the foregoing; or any corporate or other action is taken by the Company or any Subsidiary of the Company for the purpose of effecting any of the foregoing;

(iii) The Company or any Subsidiary of the Company shall default in any of its obligations under any debenture, mortgage, credit agreement or other facility, indenture agreement, factoring agreement or other instrument under which there may be issued, or by which there may be secured or evidenced any indebtedness for borrowed money or money due under any long term leasing or factoring arrangement of the Company or any Subsidiary of the Company in an amount exceeding $1,000,000, whether such indebtedness now exists or shall hereafter be created and such default shall result in such indebtedness becoming or being declared due and payable and such default is not thereafter cured within the time prescribed by the documents governing such indebtedness or, if no time is prescribed, is not thereafter cured within ten (10) Business Days;

(iv) The Common Stock shall cease to be quoted or listed for trading, as applicable, on any Primary Market for a period of ten (10) consecutive Trading Days;

(v) The Company or any Subsidiary of the Company shall be a party to any Change of Control Transaction (as defined in Section (15)) unless in connection with such Change of Control Transaction this Debenture is retired;

(vi) the Company’s (A) failure to deliver the required number of shares of Common Stock to the Holder within two (2) Trading Days after the applicable Share Delivery Date or (B) notice, written or oral, to the Holder, including by way of public announcement, at any time, of its intention not to comply with a request for conversion of any Debenture into shares of Common Stock that is tendered in accordance with the provisions of the Debenture, other than pursuant to Section (4)(c);

(vii) The Company shall fail for any reason to deliver the payment in cash pursuant to a Buy-In (as defined herein) within five (5) Business Days after such payment is due;

(viii) The Company’s failure to timely file with the Commission any Periodic Report on or before the due date of such filing as established by the Commission, it being understood, for the avoidance of doubt, that due date includes any permitted filing deadline extension under Rule 12b-25 under the Exchange Act, if such failure is not cured within ten (10) Business Days;

(ix) Any representation or warranty made or deemed to be made by or on behalf of the Company in or in connection with any Transaction Document, or any waiver hereunder or thereunder, shall prove to have been incorrect in any material respect (or, in the case of any such representation or warranty already qualified by materiality, such representation or warranty shall prove to have been incorrect) when made or deemed made;

(x) Any material provision of any Transaction Document, at any time after its execution and delivery and for any reason other than as expressly permitted hereunder or thereunder, ceases to be in full force and effect; or the Company or any other Person contests in writing the validity or enforceability of any provision of any Transaction Document; or the

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Company denies in writing that it has any or further liability or obligation under any Transaction Document, or purports in writing to revoke, terminate (other than in line with the relevant termination provisions) or rescind any Transaction Document, if such event is not cured within ten (10) Business Days;

(xi) the Company uses the proceeds of the issuance of this Debenture, whether directly or indirectly, and whether immediately, incidentally or ultimately, to purchase or carry margin stock (within the meaning of Regulations T, U and X the Federal Reserve Board, as in effect from time to time and all official rulings and interpretations thereunder or thereof), or to extend credit to others for the purpose of purchasing or carrying margin stock or to refund indebtedness originally incurred for such purpose; or

(xii) Any Event of Default (as defined in the Other Debentures or in any Transaction Document other than this Debenture) occurs with respect to any Other Debentures, or any breach of any material term of any other debenture, note, or instrument held by the Holder in the Company or any agreement between or among the Company and the Holder; or

(xiii) The Company shall fail to observe or perform any material covenant, agreement or warranty contained in, or otherwise commit any material breach or default of any provision of this Debenture (except as may be covered by Section (3)(a)(i) through (3)(a)(xii) hereof) or any other Transaction Document) which is not cured or remedied within the time prescribed or if no time is prescribed within ten (10) Business Days.

(b) During the time that any portion of this Debenture is outstanding, if any Event of Default has occurred and is continuing (other than an event with respect to the Company described in Section (3)(a)(ii)), the full unpaid Principal amount of this Debenture, together with interest and other amounts owing in respect thereof, to the date of acceleration shall become at the Holder’s election given by notice pursuant to Section (7), immediately due and payable in cash; provided that, in the case of any event with respect to the Company described in Section (3)(a)(ii), the full unpaid Principal amount of this Debenture, together with interest and other amounts owing in respect thereof to the date of acceleration, shall automatically become due and payable, in each case without presentment, demand, protest or other notice of any kind, all of which are hereby waived by the Company. Furthermore, in addition to any other remedies, to the extent this Debenture remains outstanding following a Payment Default or the Maturity Date, the Holder shall continue to have the right (but not the obligation) to convert, on one or more occasions all or part of the Conversion Amount (as defined below) in accordance with Section (4) (subject to the beneficial ownership limitations set out in 4(c)) at any time after (x) a Payment Default (provided that such Payment Default is continuing) or (y) the Maturity Date at a conversion price that for such purposes shall be equal to the lower of the Conversion Price (as defined below) or the Default Conversion Price. The Holder need not provide and the Company hereby waives any presentment, demand, protest or other notice of any kind, (other than required notice of conversion) and the Holder may immediately enforce any and all of its rights and remedies hereunder and all other remedies available to it under applicable law. Such declaration may be rescinded and annulled by the Holder in writing at any time prior to payment hereunder. No such rescission or annulment shall affect any subsequent Event of Default or impair any right consequent thereon. For the purposes hereof, an Event of Default is “continuing” if it has not been cured, remedied or waived,

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except that an Event of Default relating to a Payment Default is “continuing” if it has not been waived, or has not been cured or remedied within the time period prescribed in Section (a)(i).

(4) CONVERSION OF DEBENTURE. This Debenture shall be convertible into shares of the Company’s Common Stock, on the terms and conditions set forth in this Section (4).

(a) Conversion Right. Subject to the limitations of Section (4)(c), at any time or times on or after the Issuance Date and so long as this Debenture remains outstanding, the Holder shall be entitled to convert any portion of the outstanding and unpaid Conversion Amount (as defined below) into fully paid and nonassessable shares of Common Stock in accordance with Section (4)(b), at the Conversion Price. The number of shares of Common Stock issuable upon conversion of any Conversion Amount pursuant to this Section (4)(a) shall be determined by dividing (x) such Conversion Amount by (y) the Conversion Price. The Company shall not issue any fraction of a share of Common Stock upon any conversion. All calculations under this Section (4) shall be rounded to the nearest $0.0001. If the issuance would result in the issuance of a fraction of a share of Common Stock, the Company shall round such fraction of a share of Common Stock up to the nearest whole share if such fractional share is greater than one-half and down to the nearest whole share if such fractional share is less than one-half. The Company shall pay any and all transfer, stamp and similar taxes that may be payable with respect to the issuance and delivery of Common Stock upon conversion of any Conversion Amount.

(i) ”Conversion Amount” means the portion of the Principal and/or accrued Interest to be converted, redeemed or otherwise with respect to which this determination is being made.

(ii) ”Conversion Price” means, as of any Conversion Date (as defined below) or other date of determination $8.00 per share of Common Stock. The Conversion Price shall be adjusted from time to time pursuant to the other terms and conditions of this Debenture.

(b) Mechanics of Conversion.

(i) Optional Conversion. To convert any Conversion Amount into shares of Common Stock on any date (a “Conversion Date”), the Holder shall (A) transmit by email (or otherwise deliver), for receipt on or prior to 11:59 p.m., New York Time, on such date, a copy of an executed notice of conversion in the form attached hereto as Exhibit II (the “Conversion Notice”) to the Company and (B) if required by Section (4)(b)(iii), surrender this Debenture to a nationally recognized overnight delivery service for delivery to the Company (or an indemnification undertaking reasonably satisfactory to the Company with respect to this Debenture in the case of its loss, theft or destruction). On or before the third (3^rd) Trading Day following the date of receipt of a Conversion Notice (the “Share Delivery Date”), the Company shall (X) if legends are not required to be placed on certificates or book-entry positions of Common Stock and provided that the Transfer Agent is participating in the Depository Trust Company’s (“DTC”) Fast Automated Securities Transfer Program, credit such aggregate number of shares of Common Stock to which the Holder shall be entitled to the Holder’s or its designee’s balance account with DTC through its Deposit Withdrawal Agent Commission system or (Y) if the

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Transfer Agent is not participating in the DTC Fast Automated Securities Transfer Program or if restrictive legends are required to be placed on certificates or book entry positions of Common Stock, issue and deliver to the address as specified in the Conversion Notice, a certificate or book-entry position, registered in the name of the Holder or its designee, for the number of shares of Common Stock to which the Holder shall be entitled which certificates shall not bear any restrictive legends unless required pursuant to rules and regulations of the Commission. If this Debenture is physically surrendered for conversion and the outstanding Principal of this Debenture is greater than the Principal portion of the Conversion Amount being converted, then the Company shall as soon as practicable and in no event later than three (3) Business Days after receipt of this Debenture and at its own expense, issue and deliver to the holder a new Debenture representing the outstanding Principal not converted. The Person or Persons entitled to receive the shares of Common Stock issuable upon a conversion of this Debenture shall be treated for all purposes as the record holder or holders of such shares of Common Stock upon the transmission of a Conversion Notice.

(ii) Company’s Failure to Timely Convert. If within three (3) Trading Days after the Company’s receipt of an email copy of a Conversion Notice the Company shall fail to issue and deliver a certificate or book-entry position to the Holder or credit the Holder’s balance account with DTC for the number of shares of Common Stock to which the Holder is entitled upon its conversion of any Conversion Amount (a “Conversion Failure”), and if on or after such Trading Day the Holder purchases (in an open market transaction or otherwise) Common Stock to deliver in satisfaction of a sale by the Holder of Common Stock issuable upon such conversion that the Holder anticipated receiving from the Company (a “Buy-In”), then the Company shall, within three (3) Business Days after the Holder’s request and in the Holder’s discretion, either (i) pay cash to the Holder in an amount equal to the Holder’s total purchase price (including brokerage commissions and other out of pocket expenses, if any) for the shares of Common Stock so purchased (the “Buy-In Price”), at which point the Company’s obligation to deliver such certificate or book-entry position (and to issue such Common Stock) shall terminate, or (ii) promptly honor its obligation to deliver to the Holder a certificate, certificates or book-entry position representing such Common Stock and pay cash to the Holder in an amount equal to the excess (if any) of the Buy-In Price over the product of (A) such number of shares of Common Stock, times (B) the Closing Price on the Conversion Date.

(iii) Book-Entry. Notwithstanding anything to the contrary set forth herein, upon conversion of any portion of this Debenture in accordance with the terms hereof, the Holder shall not be required to physically surrender this Debenture to the Company unless (A) the full Conversion Amount represented by this Debenture is being converted or (B) the Holder has provided the Company with prior written notice (which notice may be included in a Conversion Notice) requesting reissuance of this Debenture upon physical surrender of this Debenture. The Holder and the Company shall maintain records showing the Principal and Interest converted and the dates of such conversions or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Debenture upon conversion. However, at the time of each such Conversion Notice, the Holder shall provide the Company with its calculation of the then-outstanding amount of the Debenture and the amount of the outstanding Debenture after satisfaction of the relevant the then-pending Conversion Notice, which shall be subject to the approval of the Company, such approval not to be unreasonably withheld.

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(c) Limitations on Conversions.

(i) Beneficial Ownership. The Holder shall not have the right to convert any portion of this Debenture (or any Other Debenture held by the Holder or its affiliates) or receive shares of Common Stock hereunder or under any such Other Debentures to the extent that after giving effect to such conversion or receipt of such shares of Common Stock, the Holder, together with any affiliate thereof, would beneficially own (as determined in accordance with Section 13(d) of the Exchange Act and the rules promulgated thereunder) in excess of 4.99% of the number of shares of Common Stock outstanding immediately after giving effect to such conversion or receipt of shares as payment of interest. Since the Holder will not be obligated to report to the Company the number of shares of Common Stock it may hold at the time of a conversion hereunder, unless the conversion at issue plus any conversions of any Other Debenture held by the Holder or its affiliates would result in the issuance of shares of Common Stock in excess of 4.99% of the then outstanding shares of Common Stock without regard to any other shares which may be beneficially owned by the Holder or an affiliate thereof, the Holder shall have the authority and obligation to determine whether the restriction contained in this Section will limit any particular conversion hereunder and to the extent that the Holder determines that the limitation contained in this Section applies, the determination of which portion of the Principal amount of this Debenture is convertible shall be the responsibility and obligation of the Holder. If the Holder has delivered a Conversion Notice for a Principal amount of this Debenture that, without regard to any other shares that the Holder or its affiliates may beneficially own other than any Conversion Notices under any Other Debenture held by the Holder or its affiliates, would result in the issuance in excess of the permitted amount hereunder, the Company shall notify the Holder of this fact and shall honor the conversion for the maximum Principal amount permitted to be converted on such Conversion Date in accordance with Section (4)(a) and, any Principal amount tendered for conversion in excess of the permitted amount hereunder shall remain outstanding under this Debenture and shall not be deemed to be an Event of Default. The provisions of this Section may be waived by the Holder upon not less than 65 days prior notice to the Company.

(ii) Principal Market Limitation. Notwithstanding anything in this Agreement to the contrary, the Company shall not issue any Common Stock pursuant to the transactions contemplated by this Debenture or any other Transaction Documents (including any shares issued pursuant to a conversion) together with any transactions aggregated with the foregoing if the issuance of such shares of Common Stock would exceed 29,016,448 (which number of shares represents 19.9% of the aggregate number of shares of Common Stock issued and outstanding as of the Agreement Date) (the “Exchange Cap”), except that such limitation shall not apply in the event that the Company (A) obtains the approval of its stockholders as required by the applicable rules of the NASDAQ Capital Market for issuances of shares of Common Stock in excess of such amount or (B) concludes, after consultation with outside counsel to the Company that such approval is not required, which conclusion shall be reasonably satisfactory to the Holder. The Exchange Cap shall be appropriately adjusted for any stock dividend, stock split, reverse stock split or similar transaction.

(d) Other Provisions.

(i) All calculations under this Section (4) shall be rounded to the nearest $0.0001 or whole share.

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(ii) The Company covenants that, so long as this Debenture or any Other Debenture remains outstanding, the number of shares of Common Stock comprised in the Company’s authorized share capital but unissued and not otherwise reserved for issuance (including (i) in relation to equity or debt securities convertible into or exchangeable or exercisable for or that can be settled in shares of Common Stock (other than the Debenture and the Other Debentures) and (ii) shares of Common Stock remaining available for issuance under the Company’s equity incentive plans) shall be not less than the maximum number of shares of Common Stock issuable upon conversion of this Debenture and the Other Debentures (assuming for purposes hereof that (x) this Debenture and such Other Debentures are convertible at the Conversion Price as of the date of determination and (y) any such conversion shall not take into account any limitations on the conversion of the Debenture or Other Debentures set forth herein or therein (the “Required Reserve Amount”)), provided that at no time shall the number of shares of Common Stock reserved pursuant to this Section (4)(d)(ii) be reduced other than proportionally with respect to all shares of Common Stock in connection with any conversion (other than pursuant to the conversion of this Debenture and the Other Debentures in accordance with their terms) and/or cancellation, or reverse stock split. If at any time the number of shares of Common Stock reserved pursuant to this Section (4)(d)(ii) becomes less than the Required Reserve Amount, the Company will promptly take all corporate action necessary to propose to its general meeting of stockholders an increase of its authorized share capital necessary to meet the Company’s obligations pursuant to this Debenture, recommending that stockholders vote in favor of such an increase. The Company covenants that, upon issuance in accordance with conversion of this Debenture in accordance with its terms, the shares of Common Stock, when issued, will be validly issued, fully paid and nonassessable.

(iii) Nothing herein shall limit the Holder’s right to pursue actual damages or declare an Event of Default pursuant to Section (3) herein for the Company’s failure to deliver certificates representing shares of Common Stock upon conversion within the period specified herein and the Holder shall have the right to pursue all remedies available to it at law or in equity including, without limitation, a decree of specific performance and/or injunctive relief, in each case without the need to post a bond or provide other security. The exercise of any such rights shall not prohibit the Holder from seeking to enforce damages pursuant to any other Section hereof or under applicable law.

(iv) Legal Opinions. The Company is obligated to use commercially reasonable efforts to cause its legal counsel to deliver legal opinions to the Company’s transfer agent in connection with any legend removal upon the expiration of any holding period or other requirement for which the Underlying Shares may bear legends restricting the transfer thereof. To the extent that such opinions are not provided (either timely or at all), then, in addition to being an Event of Default hereunder, the Company agrees to reimburse the Holder for all reasonable costs incurred by the Holder in connection with any legal opinions paid for by the Holder in connection with sale or transfer of Underlying Shares of Common Stock. The Holder shall notify the Company of any such costs and expenses it incurs that are referred to in this section from time to time and all amounts owed hereunder shall be paid by the Company with reasonable promptness.

(5) ADJUSTMENTS TO CONVERSION PRICE

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(a) Adjustment of Conversion Price upon Subdivision or Combination of Common Stock. If the Company, at any time while this Debenture is outstanding, shall (a) pay a stock dividend or otherwise make a distribution or distributions on shares of its Common Stock or any other equity or equity equivalent securities payable in shares of Common Stock, (b) subdivide outstanding shares of Common Stock into a larger number of shares, (c) combine (including by way of reverse stock split) outstanding shares of Common Stock into a smaller number of shares, or (d) issue by reclassification of shares of the Common Stock any shares of capital stock of the Company, then the Conversion Price shall be multiplied by a fraction of which the numerator shall be the number of shares of Common Stock (excluding treasury shares, if any) outstanding before such event and of which the denominator shall be the number of shares of Common Stock outstanding after such event. Any adjustment made pursuant to this Section shall become effective immediately after the record date for the determination of stockholders entitled to receive such dividend or distribution and shall become effective immediately after the effective date in the case of a subdivision, combination or re-classification.

(b) Other Corporate Events. In addition to and not in substitution for any other rights hereunder, prior to the consummation of any Fundamental Transaction pursuant to which holders of shares of Common Stock are entitled to receive securities or other assets with respect to or in exchange for shares of Common Stock (a “Corporate Event”), the Company shall make appropriate provision to ensure that the Holder will thereafter have the right to receive upon a conversion of this Debenture, at the Holder’s option, (i) in addition to the shares of Common Stock receivable upon such conversion, such securities or other assets to which the Holder would have been entitled with respect to such shares of Common Stock had such shares of Common Stock been held by the Holder upon the consummation of such Corporate Event (without taking into account any limitations or restrictions on the convertibility of this Debenture) or (ii) in lieu of the shares of Common Stock otherwise receivable upon such conversion, such securities or other assets received by the holders of shares of Common Stock in connection with the consummation of such Corporate Event in such amounts as the Holder would have been entitled to receive had this Debenture initially been issued with conversion rights for the form of such consideration (as opposed to shares of Common Stock) at a conversion rate for such consideration commensurate with the Conversion Price. Provision made pursuant to the preceding sentence shall be in a form and substance satisfactory to the Holder. The provisions of this Section shall apply similarly and equally to successive Corporate Events and shall be applied without regard to any limitations on the conversion or redemption of this Debenture.

(c) Whenever the Conversion Price is adjusted pursuant to Section (5) hereof, the Company shall promptly provide the Holder with a written notice setting forth the Conversion Price after such adjustment and setting forth a brief statement of the facts requiring such adjustment.

(d) In case of any (1) merger or consolidation of the Company or any Subsidiary of the Company with or into another Person, or (2) sale by the Company or any Subsidiary of the Company of more than one-half of the assets of the Company in one or a series of related transactions, the Holder shall have the right to (A) exercise any rights under Section (3)(b), (B) convert the aggregate amount of this Debenture then outstanding into the shares of stock and other securities, cash and property receivable upon or deemed to be held by holders of Common Stock following such merger, consolidation or sale, and the Holder shall be entitled upon

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such event or series of related events to receive such amount of securities, cash and property as the shares of Common Stock into which such aggregate Principal amount of this Debenture could have been converted immediately prior to such merger, consolidation or sales would have been entitled, or (C) in the case of a merger or consolidation, require the surviving entity to issue to the Holder a convertible Debenture with a Principal amount equal to the aggregate Principal amount of this Debenture then outstanding and held by the Holder, plus all accrued and unpaid interest and other amounts owing thereon, which such newly issued convertible Debenture shall have terms identical (including with respect to conversion) to the terms of this Debenture, and shall be entitled to all of the rights and privileges of the Holder of this Debenture set forth herein and the agreements pursuant to which this Debentures were issued. In the case of clause (C), the conversion price applicable for the newly issued shares of convertible preferred stock or convertible Debentures shall be based upon the amount of securities, cash and property that each share of Common Stock would receive in such transaction and the Conversion Price in effect immediately prior to the effectiveness or closing date for such transaction. The terms of any such merger, sale or consolidation shall include such terms so as to continue to give the Holder the right to receive the securities, cash and property set forth in this Section upon any conversion or redemption following such event. This provision shall similarly apply to successive such events.

(6) REISSUANCE OF THIS DEBENTURE.

(a) Transfer. If this Debenture is to be transferred, the Holder shall surrender this Debenture to the Company, whereupon the Company will forthwith issue and deliver upon the order of the Holder a new Debenture (in accordance with Section (6)(d)), registered in the name of the registered transferee or assignee, representing the outstanding Principal being transferred by the Holder (along with any accrued and unpaid interest thereof) and, if less than the entire outstanding Principal is being transferred, a new Debenture in accordance with Section (6)(d)) to the Holder representing the outstanding Principal not being transferred. The Holder and any assignee, by acceptance of this Debenture, acknowledge and agree that, by reason of the provisions of Section (4)(b)(iii) following conversion or redemption of any portion of this Debenture, the outstanding Principal represented by this Debenture may be less than the Principal stated on the face of this Debenture.

(b) Lost, Stolen or Mutilated Debenture. Upon receipt by the Company of evidence reasonably satisfactory to the Company of the loss, theft, destruction or mutilation of this Debenture, and, in the case of loss, theft or destruction, of any indemnification undertaking by the Holder to the Company in customary form and, in the case of mutilation, upon surrender and cancellation of this Debenture, the Company shall execute and deliver to the Holder a new Debenture (in accordance with Section (6)(d)) representing the outstanding Principal.

(c) Debenture Exchangeable for Different Denominations. This Debenture is exchangeable, upon the surrender hereof by the Holder at the principal office of the Company, for a new Debenture or Debentures (in accordance with Section (6)(d)) representing in the aggregate the outstanding Principal of this Debenture, and each such new Debenture will represent such portion of such outstanding Principal as is designated by the Holder at the time of such surrender.

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(d) Issuance of New Debentures. Whenever the Company is required to issue a new Debenture pursuant to the terms of this Debenture, such new Debenture (i) shall be of like tenor with this Debenture, (ii) shall represent, as indicated on the face of such new Debenture, the Principal remaining outstanding (or in the case of a new Debenture being issued pursuant to Section 5(6)(a) or Section 5(6)(c), the Principal designated by the Holder which, when added to the Principal represented by the other new Debentures issued in connection with such issuance, does not exceed the Principal remaining outstanding under this Debenture immediately prior to such issuance of new Debentures), (iii) shall have an issuance date, as indicated on the face of such new Debenture, which is the same as the Issuance Date of this Debenture, (iv) shall have the same rights and conditions as this Debenture, and (v) shall represent accrued and unpaid Interest from the Issuance Date.

(7) NOTICES. Any notices, consents, waivers or other communications required or permitted to be given under the terms hereof must be in writing by letter and email and will be deemed to have been delivered: upon the later of (A) either (i) receipt, when delivered personally or (ii) one (1) Business Day after deposit with an overnight courier service with next day delivery specified, in each case, properly addressed to the party to receive the same and (B) receipt, when sent by electronic mail. The addresses and e-mail addresses for such communications shall be:

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or at such other address and/or email and/or to the attention of such other person as the recipient party has specified by written notice given to each other party three (3) Business Days prior to the effectiveness of such change. Written confirmation of receipt (i) given by the recipient of such notice, consent, waiver or other communication, (ii) electronically generated by the sender’s email service provider containing the time, date, recipient email address or (iii) provided by a nationally recognized overnight delivery service, shall be rebuttable evidence of personal service, receipt by facsimile or receipt from a nationally recognized overnight delivery service in accordance with clause (i), (ii) or (iii) above, respectively.

(8) NO IMPAIRMENT. Except as expressly provided herein, no provision of this Debenture shall alter or impair the obligations of the Company, which are absolute and unconditional, to pay the Principal of, interest and other charges (if any) on, this Debenture at the time, place, and rate, and in the coin or currency, herein prescribed. This Debenture is a direct obligation of the Company. As long as this Debenture is outstanding, the Company shall not and shall cause its subsidiaries not to, without the consent of the Holder, (i) amend its certificate of incorporation, bylaws or other charter documents so as to adversely affect any rights of the Holder; (ii) repay, repurchase or offer to repay, repurchase or otherwise acquire shares of its Common Stock or other equity securities; (iii) enter into any agreement with respect to any of the foregoing; or (iv) enter into any agreement, arrangement or transaction in or of which the terms thereof would restrict, materially delay, conflict with or impair the ability of the Company to perform its obligations in accordance with the terms and conditions of this Debenture, including, without limitation, the obligation of the Company to make cash payments hereunder.

(9) This Debenture shall not entitle the Holder to any of the rights of a stockholder of the Company, including without limitation, the right to vote, to receive dividends and other distributions, or to receive any notice of, or to attend, meetings of stockholders or any other proceedings of the Company, unless and to the extent converted into shares of Common Stock in accordance with the terms hereof.

(10) GOVERNING LAW; JURISDICTION; SERVICE; JURY TRIAL. All questions concerning the construction, validity, enforcement, and interpretation of this Agreement shall be governed by the internal laws of the State of New York, without giving effect to any choice of law or conflict of law provision or rule (whether of the State of New York or any other jurisdictions) that would cause the application of the laws of any jurisdictions other than the State of New York. The Company hereby irrevocably submits to the exclusive jurisdiction of the state and federal courts sitting in The City of New York, Borough of Manhattan, for the adjudication of any dispute hereunder or in connection herewith or under any of the other Transaction Documents or with any transaction contemplated hereby or thereby, and hereby irrevocably waives, and agrees not to assert in any suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of any such court, that such suit, action or proceeding is brought in an inconvenient forum or that the venue of such suit, action or proceeding is improper. Each party hereby irrevocably waives personal service of process and consents to process being served in any such suit, action or proceeding by mailing a copy thereof to such party at the address for such notices to it under this Agreement and agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained herein shall be deemed to limit in any way any right to serve process in any manner permitted by law. Nothing contained herein shall be deemed

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or operate to preclude any Buyer from bringing suit or taking other legal action against the Company in any other jurisdiction to collect on the Company’s obligations to such Buyer or to enforce a judgment or other court ruling in favor of such Buyer. EACH PARTY HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE TO, AND AGREES NOT TO REQUEST, A JURY TRIAL FOR THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR UNDER ANY OTHER TRANSACTION DOCUMENT OR IN CONNECTION WITH OR ARISING OUT OF THIS AGREEMENT, ANY OTHER TRANSACTION DOCUMENT OR ANY TRANSACTION CONTEMPLATED HEREBY OR THEREBY.

(11) FEE REIMBURSEMENT. If the Company fails to strictly comply with the terms of this Debenture, then the Company shall reimburse the Holder promptly for all reasonable and documented fees, costs and expenses, including, without limitation, reasonable attorneys’ fees and expenses incurred by the Holder in any action in connection with this Debenture, including, without limitation, those incurred: (i) during any workout, attempted workout, and/or in connection with the rendering of legal advice as to the Holder’s rights, remedies and obligations, (ii) collecting any sums which become due to the Holder, (iii) defending or prosecuting any proceeding or any counterclaim to any proceeding or appeal; or (iv) the protection, preservation or enforcement of any rights or remedies of the Holder.

(12) WAIVER. Any waiver by the Holder of a breach of any provision of this Debenture shall not operate as or be construed to be a waiver of any other breach of such provision or of any breach of any other provision of this Debenture. The failure of the Holder to insist upon strict adherence to any term of this Debenture on one or more occasions shall not be considered a waiver or deprive that party of the right thereafter to insist upon strict adherence to that term or any other term of this Debenture. Any waiver must be in writing.

(13) UNENFORSEABILITY. If any provision of this Debenture is invalid, illegal or unenforceable, the balance of this Debenture shall remain in effect, and if any provision is inapplicable to any person or circumstance, it shall nevertheless remain applicable to all other persons and circumstances. If it shall be found that any interest or other amount deemed interest due hereunder shall violate applicable laws governing usury, the applicable rate of interest due hereunder shall automatically be lowered to equal the maximum permitted rate of interest. The Company covenants (to the extent that it may lawfully do so) that it shall not at any time insist upon, plead, or in any manner whatsoever claim or take the benefit or advantage of, any stay, extension or usury law or other law which would prohibit or forgive the Company from paying all or any portion of the Principal of or interest on this Debenture as contemplated herein, wherever enacted, now or at any time hereafter in force, or which may affect the covenants or the performance of this indenture, and the Company (to the extent it may lawfully do so) hereby expressly waives all benefits or advantage of any such law, and covenants that it will not, by resort to any such law, hinder, delay or impeded the execution of any power herein granted to the Holder, but will suffer and permit the execution of every such as though no such law has been enacted.

(14) COUNTERPARTS. This Agreement may be executed in identical counterparts, each of which shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered to the other party. Facsimile or other electronically scanned and delivered signatures (including any electronic

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signature covered by the U.S. federal ESIGN Act of 2000, Uniform Electronic Transactions Act, the Electronic Signatures and Records Act or other applicable law, e.g., www.docusign.com), including by e-mail attachment, shall be deemed to have been duly and validly delivered and be valid and effective for all purposes of this Agreement.

(15) CERTAIN DEFINITIONS. For purposes of this Debenture, the following terms shall have the following meanings:

(a) ”Bloomberg” means Bloomberg Financial Markets.

(b) “Business Day” means any day except Saturday, Sunday and any day which shall be a federal legal holiday in the United States or a day on which banking institutions are authorized or required by law or other government action to close.

(c) “Change of Control Transaction” means the occurrence of (a) an acquisition after the date hereof by an individual or legal entity or “group” (as described in Rule 13d-5(b)(1) promulgated under the Exchange Act) of effective control (whether through legal or beneficial ownership of capital stock of the Company, by contract or otherwise) of in excess of fifty percent (50%) of the voting power of the Company (except that the acquisition of voting securities by the Holder or any other current holder of convertible securities of the Company shall not constitute a Change of Control Transaction for purposes hereof), (b) a replacement at one time or over time of more than one-half of the members of the board of directors of the Company (other than as due to the death or disability of a member of the board of directors) which is not approved by a majority of those individuals who are members of the board of directors on the date hereof (or by those individuals who are serving as members of the board of directors on any date whose nomination to the board of directors was approved by a majority of the members of the board of directors who are members on the date hereof), (c) the merger, consolidation or sale of fifty percent (50%) or more of the assets of the Company or any Subsidiary of the Company in one or a series of related transactions with or into another entity, or (d) the execution by the Company of an agreement to which the Company is a party or by which it is bound, providing for any of the events set forth above in (a), (b) or (c). No transfer to a wholly-owned Subsidiary shall be deemed a Change of Control Transaction under this provision.

(d) “Closing Price” means the price per share in the last reported trade of the Common Stock on a Primary Market or on the exchange which the Common Stock is then listed as quoted by Bloomberg.

(e) “Commission” means the Securities and Exchange Commission.

(f) “Common Stock” means the common stock, par value $0.0001, of the Company and stock of any other class into which such shares may hereafter be changed or reclassified.

(g) “Default Conversion Price” shall mean a price per share of Common Stock equal to 95% of the lowest daily VWAP during the five (5) consecutive Trading Days immediately preceding the Conversion Date but not lower than $2.00 per share.

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

(i) “Fundamental Transaction” means any of the following: (1) the Company effects any merger or consolidation of the Company with or into another Person and the Company is the non-surviving company (other than a merger or consolidation with a wholly owned Subsidiary of the Company for the purpose of redomiciling the Company), (2) the Company effects any sale of all or substantially all of its assets in one or a series of related transactions, (3) any tender offer or exchange offer (whether by the Company or another Person) is completed pursuant to which holders of Common Stock are permitted to tender or exchange their shares for other securities, cash or property, or (4) the Company effects any reclassification of the Common Stock or any compulsory share exchange pursuant to which the Common Stock is effectively converted into or exchanged for other securities, cash or property.

(j) “Other Debentures” means any other debentures issued pursuant to the Securities Purchase Agreement and any other debentures, notes, or other instruments issued in exchange, replacement, or modification of the foregoing.

(k) “Periodic Reports” shall mean the Company’s (i) Annual Report on Form 10-K for the fiscal year ended December 31, 2022, (ii) any current report to be filed on Form 10-Q for periods during the fiscal year ended December 31, 2023 and (iii) all other reports required to be filed by the Company with the Commission under applicable laws and regulations (including, without limitation, Regulation S-K) for so long as any amounts are outstanding under this Debenture or any Other Debenture; provided that all such Periodic Reports shall include, when filed, all information, financial statements, audit reports (when applicable) and other information required to be included in such Periodic Reports in compliance with all applicable laws and regulations.

(l) “Person” means a corporation, an association, a partnership, organization, a business, an individual, a government or political subdivision thereof or a governmental agency.

(m) “Primary Market” means the Nasdaq Capital Market; provided however, that in the event the Common Stock is ever listed or traded on the Nasdaq Global Market, the New York Stock Exchange, or the NYSE American, then the “Primary Market” shall mean such other market or exchange on which the Common Stock is then listed or traded to the extent such other market or exchange is the principal trading market or exchange for the Common Stock.

(n) “Redemption Premium” means 10% of the Principal amount being redeemed.

(o) “Registration Rights Agreement” means the registration rights agreement dated as of March 21, 2023, as it may be amended from time to time, between the Company and the Holder.

(p) “Securities Act” means the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder.

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(q) “Subsidiary” means, with respect to any Person, any corporation, association, partnership or other business entity of which more than 50% of the total voting power of shares of capital stock or other interests (including partnership interests) entitled (without regard to the occurrence of any contingency) to vote in the election of directors, managers, general partners or trustees thereof is at the time owned or controlled, directly or indirectly, by (i) such Person; (ii) such Person and one or more Subsidiaries of such Person; or (iii) one or more Subsidiaries of such Person.

(r) “Trading Day” means a day on which the shares of Common Stock are quoted or traded on a Primary Market on which the shares of Common Stock are then quoted or listed; provided that, in the event that the shares of Common Stock are not listed or quoted, then Trading Day shall mean a Business Day.

(s) “Transaction Document” means, each of, this Debenture, the Other Debentures, the Securities Purchase Agreement, the Registration Rights Agreement and any and all documents, agreements, instruments or other items executed or delivered in connection with any of the foregoing.

(t) “Underlying Shares” means the shares of Common Stock issuable upon conversion of this Debenture or as payment of interest in accordance with the terms hereof.

(u) “Underlying Shares Registration Statement” means a registration statement meeting the requirements set forth in the Registration Rights Agreement, covering among other things the resale of the Underlying Shares and naming the Holder as a “selling stockholder” thereunder.

(v) ”VWAP” means, for any security as of any date, the daily dollar volume-weighted average price for such security on the Primary Market as reported by Bloomberg through its “Historical Prices – Px Table with Average Daily Volume” functions.

(w) “Yorkville SEPA” means the amended and restated standby equity purchase agreement dated as of February 8, 2023, as it may be amended from time to time, between the Company and the Holder.

[Signature Page Follows]

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IN WITNESS WHEREOF, the Company has caused this Convertible Debenture to be duly executed by a duly authorized officer as of the date set forth above.

EXHIBIT II

CONVERSION NOTICE

(To be executed by the Holder in order to Convert the Debenture)

TO: SCILEX HOLDING COMPANY

Via Email:

The undersigned hereby irrevocably elects to convert a portion of the outstanding and unpaid Conversion Amount of Debenture No. SCLX-3 into Shares of Common Stock of SCILEX HOLDING COMPANY, according to the conditions stated therein, as of the Conversion Date written below.