I'd also check with the vet first. Most human pills are too much for a cat and could make them sick or even kill them. When Sunny had an URI my vet gave me an immunity booster called Vetri-DMG. It's a liquid that you can put in their food. I gave it to all 3 cats and Storm and Pepper never caught the URI from Sunny. I had to squirt it in their mouths and they hated the taste.