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FDA-approved Paradyne is not a messy pesticide. Paradyne is a medicine that is applied topically and works inside and out to protect your cat against fleas, heartworms, and several other harmful and irritating parasites.


About Vethical Paradyne® (selamectin), Topical Parasiticide for Cats

FDA-approved Paradyne is a unique, topically applied, medication for cats that is proven to be effective against all important external and internal feline parasites. Most other topical flea products only treat on the outside. Paradyne works inside and out, fighting off adult fleas and ear mites, preventing flea eggs from hatching and keeping your cat safe from deadly heartworms and other internal parasites—all in one convenient, easy-to-use product (no pills required).

Paradyne is the first-ever FDA-approved, topically applied medication for cats that:

  • Kills adult fleas (Ctenocephalides felis) and prevents flea eggs from hatching.
  • Prevents heartworm disease caused by Dirofilaria immitis.
  • Treats and controls ear mites (Otodectes cynotis).
  • Treats and controls roundworms (Toxocara cati) and hookworms (Ancylostoma tubaeforme).

How it works:

Paradyne enters the bloodstream through the skin. Concentrations of Paradyne in the blood and tissues prevent heartworm disease and prevents and treats roundworm and hookworm infections. Paradyne selectively redistributes from the blood to the skin and other tissues, where it provides protection against fleas, flea eggs, and ear mites.


Applying Vethical Paradyne® (selamectin), Topical Parasiticide for Cats

Paradyne application

Product Insert

Important Safety Information:

Do not use on sick, weak, or underweight animals. Use only on dogs 6 weeks and older. Use only on cats 8 weeks and older. Prior to administration, dogs should be tested for heartworms. In cats, side effects may include digestive upset and temporary hair loss at application site with possible inflammation. In humans, Paradyne® may be irritating to skin and eyes. Wash hands after use. For more information, see Full Prescribing Information.