What to do when you give your cat too much flea medicine?

they might be lethargic and then you can notice that the are not walking right and starts twiching that gets worse and becomes convulsions or seizures and they might could die depending on your cat and how much you put on it. would reconmend only using the flea medicine your vet gives you and not to uses the kind from Walmart of any other store and would ask the vet to put it on and to maybe stay at the vet for awhile to make sure your cat is out of danger of a reaction.