Advantage II Large Cat is a vet-recommended, monthly topical flea treatment and prevention solution designed for large cats weighing over 9 lbs and at least 8 weeks of age. This Costco value pack includes an 8-month supply of individual spot-on applicators, offering significant savings over single-dose purchases. The product is made by Elanco and is available over the counter — no prescription required.

Each applicator delivers total flea protection by killing adult fleas, flea larvae, and flea eggs through contact, meaning fleas do not have to bite your cat to die. Advantage II starts working fast, killing fleas within 12 hours of a single application, and continues to protect for a full 30 days. By eliminating all stages of the flea life cycle, it both controls existing infestations and prevents new ones from taking hold. Monthly use also helps protect cats from flea-related health risks such as tapeworm transmission, Flea Allergy Dermatitis, and flea bite anemia.

Application is simple and quick: part the fur on the back of your cat's neck at the base of the skull, place the tube tip on the skin, and squeeze the entire contents out. There are no hard-to-swallow pills or complicated procedures. The fragrance-free formula becomes waterproof 24 hours after application and is effective for both indoor and outdoor cats.