Activyl is a monthly spot-on flea control for dogs. The active ingredient in Activyl is indoxacarb, which works by bioactivation – enzymes inside the flea activate indoxacarb and release its full flea-killing power. There is no known flea resistance to indoxacarb. Activyl stops fleas from feeding, kills all flea stages (egg, larvae and adult), and inhibits flea development in the environment.

Indicated for use once a month on dogs and puppies that weigh over 4 lb and are 8 weeks of age or older.