If your dog or cat has fleas, you need Comfortis® (spinosad)

When it comes to eliminating fleas on your dog or cat, you want a flea medicine you can trust. Treat your pet’s flea infestation with Comfortis, the #1 recommended prescription flea-only medication.1,2

Comfortis is the FDA-approved chewable, beef-flavored tablet that kills fleas and prevents flea infestations on dogs and cats for a full month. Comfortis is:

  • Convenient. Easy to give and mess-free.
  • Fast. Starts killing fleas in 30 minutes—before they can lay eggs. Comfortis killed 100% of fleas on dogs and 98% of fleas on cats in just four hours in controlled laboratory studies.
  • Effective. Provides full flea protection for an entire month.

Comfortis is for both dogs and cats. It’s approved for use in cats 14 weeks of age or older and 4.1 pounds of body weight or greater. It’s approved for dogs 14 weeks of age or older and 5.0 pounds of body weight or greater.

Family-friendly Flea Protection

Comfortis offers an easy and convenient flea treatment your family can live with. 

  • No need to isolate. With Comfortis, simply treat and play. There’s no need to isolate your dog or cat from children or other household pets. 
  • No Washing off. Comfortis can't be scrubbed, rubbed or shaken off while bathing, grooming or swimming.

Comfortis is not for use in humans. Like all medications, keep Comfortis out of reach of children.




How to Use Comfortis

While you should consult your veterinarian about your pet’s specific needs, these are the general guidelines for administering Comfortis:

  • Administer every month.
  • Administer year-round without interruption for best results.
  • Give with food for maximum effectiveness.
  • Administer the correct dose as prescribed by your veterinarian.
  • If you miss a dose, give Comfortis immediately and resume regular monthly dosing.

View the Comfortis product label for more details.

Learn more about dosing & administration

Ask your veterinarian

Comfortis can be found in your veterinarian’s office—your source for the best pet health care advice.

Your veterinarian can ensure the proper dosage of Comfortis, and can recommend other products to help protect the health of your dog or cat. You trust your veterinarian to look out for your pet, so trust them to help you find the right solution to eliminate fleas and keep them from coming back.

Your veterinarian can also make recommendations about peak times and duration for fleas in your geographic area, as well as for your specific household. For instance, to minimize the likelihood of flea re-infestation, it's best to simultaneously treat all animals in your household with an approved flea product.

Green Chemistry

The introduction of spinosad for use in agriculture resulted in the receipt of a Presidential Green Chemistry Challenge Award3 in 1999 from the U.S. Environmental Protection Agency. The award was presented to Dow AgroSciences LLC in the category of “Designing Safer Chemicals,” for the introduction of spinosad as an insect control product for use on crops. This award demonstrates that spinosad as a technology for insect control has a favorable environmental profile. This award is not relevant to the safety and efficacy of Comfortis, nor does it confer any environmental benefit to Comfortis.