Bravecto is a tasty chewable tablet for dogs which protects against fleas and ticks during up to 12 weeks. The active ingredient in Bravecto is fluralaner. Fluralaner has a flea-killing and tick-killing effect. The fluralaner is absorbed into the bloodstream after taking the chewable tablet. Fleas and ticks attach to your dog and begin to feed. As a result they are exposed to the active ingredient and the effect occurs within 8 hours (fleas) to 12 hours (ticks). The effect against fleas and ticks will last 12 weeks. The effect against the tick R. sanguineus however, lasts only 8 weeks.