As filed with the Securities and Exchange Commission on November 19, 2025. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 MEDICUS PHARMA LTD. (Exact name of Registrant as specified in its charter) ______________________________ (State or other jurisdiction of incorporation or organization) Ontario, Canada 2834 98-1778211 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Ide ...