Company: MDCXW
Filing Date: 2025-05-13
Form Type: 424B3
Source: 0001062993-25-009166
Chunk: 1

Company: Medicus Pharma Ltd.
Filing Date: 2025-05-13
Form: 424B3
Chunk 1
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 this prospectus supplement is truthful or complete. Any representation to the contrary is a criminal offense.

<div align='center'>The date of this prospectus supplement is May 13, 2025.</div>

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from___ to ___ Commission file number: 001-42408 MEDICUS PHARMA LTD. (Exact Name of Registrant as Specified in Its Charter)

| Ontario, Canada                          |     |         98-1778211 |
| (State or other jurisdiction of          
 incorporation or organization)           |     |   -I.R.S. Employer 
 Identification No. |
| 300 Conshohocken State Rd., Suite 200    
 W. Conshohocken, PA                      |     |              19428 |
| (Address of principal executive offices) |     |          -Zip Code |

(610) 636-0184 (Registrant's telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act:

| Title of each class                           |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Common shares, no par value                   |     | MDCX              |     | The Nasdaq Capital Market                 |
| Warrants, each exercisable for one common     
 share at an exercise price of $4.64 per share |     | MDCXW             |     | The Nasdaq Capital Market                 |

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
Yes ☒ No ☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T(§232