Note Extension Agreement dated as of May 18, 2023, by and between the Registrant and the Geoffrey S. Dow Revocable Trust

Exhibit 10.55

NOTE EXTENSION AGREEMENT

THIS NOTE EXTENSION AGREEMENT (this “Agreement”) is entered into and made effective as of May 18, 2023, by and between 60 DEGREES PHARMACEUTICALS, INC., a Delaware corporation (the “Maker”) and GEOFFREY S. DOW REVOCABLE TRUST (the “Holder”).

WHEREAS, the Maker and the Holder entered into that certain Promissory Note dated as of May 19, 2022 for the amount of Forty-Four Thousand Four-Hundred Forty-Four Dollars and Forty-Four Cents ($44,444.44) (the “Note”). The Note is due and payable on May 19, 2023 (the “Maturity Date”).

WHEREAS, the Maker and the Holder desire to enter into this Agreement in order to extend the Maturity Date in exchange for a cash payment of One Thousand One Hundred Eleven Dollars and Eleven Cents ($1,111.11) (the “Cash Payment”).

NOW, THEREFORE, this Agreement is duly agreed by both the Maker and the Holder to extend the Maturity Date to the earlier of (i) July 18, 2023, (ii) the date of the Maker’s initial public offering, and (iii) such earlier date as the Note is required or permitted to be repaid as provided thereunder, in exchange for the Cash Payment, with all other terms and conditions of the Note remaining in full force and effect.

[Signature page follows]

IN WITNESS WHEREOF, the undersigned have duly executed this Agreement as of the day and year first written above.

Signature Page to Note Extension Agreement (Dow Trust)