Exhibit 23.4

Consent of Independent Registered Public Accounting Firm

Addex Therapeutics Ltd

Geneva, Switzerland

We hereby consent to the incorporation by reference in the Prospectus constituting a part of this Post-Effective Amendment No. 1 to the Registration Statement on FormF-1 (File No. 333-262050) of our report dated March 10, 2022, relating to the consolidated financial statements of Addex Therapeutics Ltd appearing in the Company’s Annual Report on Form 20-F for the year ended December 31, 2021.

We also consent to the reference to us under the caption “Experts” in the Prospectus.

BDO AG
Christoph Tschumi	Nigel Le Masurier

Zurich, March 31, 2022