I've definitely gotten counterfeit Advantage flea medication from Amazon. A) It didn't work, and B) the cats had no reaction to applying it (usually they hate

I've definitely gotten counterfeit Advantage flea medication from Amazon. A) It didn't work, and B) the cats had no reaction to applying it (usually they hate it because it burns a little on the skin). Packaging was about perfect, and the applicators were filled with water. Now I only buy it from the local pet store, where I can make the safe assumption they're sourcing the stuff responsibly.