Safe, easy flea protection in a monthly, flavored tablet
Save up to $25

Available by prescription from your veterinarian.

Safe, easy flea protection in a monthly, flavored tablet

Starts killing fleas in just 30 minutes

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One little flea can't possibly be a problem, can it?

It can. A single female flea can produce up to 50 eggs a day,1 turning “one little flea” into a full-blown infestation before you even know it's there. Comfortis® (spinosad),now available for dogs and cats, starts killing fleas before they lay eggs and provides a full month of flea protection to help prevent future flea infestations. In fact, veterinarians give Comfortis for dogs the highest overall satisfaction rating when compared to other monthly flea control products.2

And Comfortis is easy to administer! A flavored tablet is administered orally, so no residue, no worries about washing off after swimming, bathing, or grooming.

Comfortis flea protection is available through veterinarians, so you can feel confident you're getting the right dosage for your dog or cat. Ask your veterinarian if Comfortis is right for you and your pet. Or visit our about Comfortis page to learn more before your next vet visit.

Email Reminder

Email Reminder

Receive an email or text message reminder from your pet when it's time to administer Comfortis.

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Important Safety Information

For cats: The most common adverse reaction recorded in clinical trials was vomiting. Other adverse reactions were: lethargy, decreased appetite, weight loss, and diarrhea. Use with caution with concomitant extra-label use of ivermectin.

The safe use of Comfortis in breeding, pregnant, or lactating cats has not been evaluated. See Comfortis label for complete safety information.

For dogs: The most common adverse reaction reported is vomiting. Other adverse reactions reported in decreasing order of frequency are: depression/lethargy, decreased appetite, incoordination, diarrhea, itching, trembling, excessive salivation and seizures.

Following concomitant extra-label use of ivermectin with Comfortis, some dogs have experienced the following clinical signs: trembling/twitching, salivation/ drooling, seizures, incoordination, excessive dilation of pupils, blindness and disorientation. Post-approval experience continues to support the safety of Comfortis when used concurrently with heartworm preventatives according to label directions.

Use with caution in breeding females and dogs with pre-existing epilepsy. The safe use of Comfortis in breeding males has not been evaluated.See Comfortis label for complete safety information.


1. Dryden, M.W. Host association, on-host longevity and egg production of Ctenocephalides felis, Vet Parasitol 1989; 34:117–122

2. Ipsos Forward Research January 2011: Veterinarians