What Is the Treatment for Tapeworm in Cats? You'll need to treat your adult cat with a deworming product every 1 to 3 months. Speak to your vet about getting the right kind of dewormer for your cats.

The more parasites you can prevent with one treatment, the better off your cat will be. You can purchase prescription medicines from your vet or at online pet stores like Chewy, Petco, and Petsmart.

What to consider when buying flea treatments for cats “First and foremost, remember that cats are not small dogs,” says Nelson. “Meaning, canine medication is not appropriate for felines.