Because Capstar only lasts 24 hours, experts at Wag! recommend pairing it with a long-term preventative (like a monthly topical or collar) to break the flea life cycle entirely. It is safe to use Capstar alongside these other treatments.

: It begins killing adult fleas in 30 minutes and achieves over 90% effectiveness within 4 hours for dogs.

Capstar is designed to kill adult fleas currently on your dog. It does not provide long-term prevention against eggs or larvae. : Dogs 2–25 lbs : 11.4 mg tablet (typically the Blue box).

Fast Relief: Why Capstar is the Go-To for Sudden Flea Infestations