Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-290180) of LB Pharmaceuticals Inc (the Company) of our report dated March 26, 2026 relating to the financial statements which appears in this Annual Report on Form 10-K.

/s/ BDO USA, P.C.

New York, NY

March 26, 2026