Is Comfortis on Sale? November 2026

Questions and answers

How does Comfortis work?

The chew contains spinosad, which overstimulates the flea's nervous system and kills fleas before they lay eggs. It treats existing adult flea infestations but does not prevent fleas from jumping on the pet, so it is often paired with an insect growth regulator or environmental control.

What is the difference between the pack sizes?

Pack sizes are set by the pet's weight band, not by the number of tablets alone. The 270mg chew suits cats 6.1-12 lbs and dogs 10-20 lbs, while the 810mg chew is for dogs 40-60 lbs. Each pack holds six monthly doses.

Does Comfortis have a warranty or guarantee?

Comfortis is a prescription product from Elanco, and the manufacturer's satisfaction terms are handled through the company and the prescribing veterinarian. Keep the prescription record, since returns and claims usually require it.

Can I return Comfortis if my pet reacts to it?

Return rules depend on the store and on whether the pack is opened. Prescription items are often non-returnable once dispensed, so check the store's policy before ordering and talk to your vet about side effects such as vomiting.

When is Comfortis typically on sale?

Flea and tick products see the most promotional activity in spring and early summer, ahead of peak flea season. Multi-pack purchases and autoship programs are the usual ways stores lower the effective cost per dose.

Are there Comfortis discount codes?

Deal.ai checks what Comfortis products actually cost at every store, so a real markdown shows on this page as a deal as soon as it starts, and each product's page has its price history to tell a sale from its usual price.