Bests & Worsts Reviews from Amazon

AVOID: This product caused what looks like a burn mark on my cat exactly where I applied it. There is prob a 2 inch patch of fur that is now completely bald. The 4 year old cat has never had any issues from Advantage II in the past. A week after I used it- Amazon emailed me telling me to immediately dispose of the rest of the medication. I contacted Amazon for more info and they couldn't (wouldn't?) explain the reason for recalling the medication. Im wondering if this product is even authentic. 100% avoid!