I have 5 cats in the house with my Artica and I would never use Advantix due to the risk of something happening with the cats. My vet here and in Canada also recommends Frontline Plus. If there is the slightest chance it could hurt my kitties it doesn't even come through the door but that is just me. I am an overprotective pet parent.
IMO I would make an exchange for Frontline Plus and ditch the Advantix. I haven't heard many good things about it anyway. Good Luck.
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