X0508 4/A 2023-07-20 2023-07-21 0001540159 Edesa Biotech, Inc. EDSA 0001978257 Marshall Patrick C/O EDESA BIOTECH, INC. 100 SPY COURT MARKHAM A6 L3R 5H6 ONTARIO, CANADA true false Share Option (right to buy) 0.8277 2023-07-20 4 A false 20000 0 A 2033-07-20 Common Shares 20000 20000 D This option vests monthly in equal proportions over 12 months beginning on the date of grant. This amendment on Form 4/A is being filed to amend the Form 4 filed on July 21, 2023, solely to correct an administrative error in the expiration date of the Share Option previously reported in Column 6 of Table II. /s/ Patrick Marshall 2023-07-24