It is a once-a-month application that kills 98% to 100% of fleas. Their larvae within 12 hours. In addition, it kills re-infesting fleas are killed within 2 hours and kills fleas before they have the chance to lay eggs. Effective up to 6 weeks!
It is applied to the back of the neck for cats and between the shoulder blades for dogs. This water-resistant flea medication spreads naturally across the skin surface at the hair root level. It is aided by body movement to provide whole body coverage.