Comfortis^® (spinosad) for Dogs: Frequently Asked Questions

Q: What are Comfortis^® (spinosad) chewable tablets?

Comfortis is a chewable, beef-flavored tablet you give to your dog to kill fleas and prevent flea infestations for one month. Comfortis chewable tablets are recommended for monthly use in dogs and puppies 14 weeks of age or older.

Q: What is spinosad?

Spinosad is the active ingredient in Comfortis. It belongs to a new novel class of antiparasitics known as spinosyns, which are derived from a naturally-occurring soil microbe. It works by attacking the nervous system of insects, causing rapid death of adult fleas.

Q: How long does Comfortis last?

Comfortis has demonstrated full effectiveness over a 30-day duration.

Q: When should treatment with Comfortis begin?

Treatment with Comfortis chewable tablets can begin at any time of the year. Comfortis is most effective when given one month before fleas become active and monthly dosing is continued through the end of the flea season. In areas where fleas are common year-round, monthly treatment with Comfortis chewable tablets should continue throughout the entire year without interruption. To minimize the likelihood of flea reinfestation, it is important for you to treat all animals in your household with a veterinarian-approved flea protection product.

Consult your veterinarian for the flea treatment options most appropriate for your area.

Q: Can Comfortis be given to cats?

No. Comfortis is not registered for use on cats. Comfortis was developed exclusively for administration to dogs.

Talk to your veterinarian about any flea control product before administering or applying it to your pet to ensure it's the best choice for your pet's health. Involving your veterinarian in your pet's healthcare choices helps you avoid the expense — and potential danger — of the guesswork involved with using direct-to-consumer treatments