kills adult fleas on your cat within 30 minutes. It doesn't have any lasting effects, though. Spinosad (Comfortis) is a fast-acting chewable that starts killing fleas before they lay eggs.

Our top picks for the best flea treatments for cats Best topical overall: Revolution Plus Topical Solution - See at Chewy Best OTC topical: Frontline Plus for Cats - See at Chewy Best fast-acting ...

Best pill Simparica TRIO is our pick for the best flea and tick treatment for dogs in pill form. The fast-acting chewable tablet kills more parasites than any other oral product. It starts to work ...