Comfortis is the first FDA-approved, chewable tablet that kills fleas and prevents flea infestations on dogs for a full month. Only Comfortis offers you all of these benefits in a single product: Starts killing fleas within 30 minutes. Lasts a full month. Kills fleas before they can lay eggs. The convenience of a chewable, synthetic beef-flavored tablet. Spinosad, the active ingredient in Comfortis, is environmentally friendly.
Elanco Animal Health