CAUTION. DO NOT ATTEMPT TO DOSE A CAT WITH IVERMECTIN. THE REQUIRED DOSAGE IS SO LOW, YOU CANT DO IT FROM HUMAN OR HORSE SOURCE PASTE. DONT TRY. YOUR CAT WILL GO INTO A COMA WITH EVEN A TINY DAB OB YOUR FINGER. /psa
(2017) https://vetgirlontherun.com/ivermectin-toxicity-in-a-cat-vetgirl-veterinary-continuing-education-blog/
it's effective in felines, but the dosage is CRITICAL.