I don't want to add stress to you but PLEASE always get flea meds from your vet . and have then administer them. After our scare in April I don't want to have any cat or human go thew that. And $400.00 vet bill for a flea treat ment (no good) Luckly our old boy pulled though and no side effects . But it was touch and go for an entire weekend. PLeas a small vet bill is nothing for piece of mind and safety for your pet.