General description Johnson's 4 Fleas Spot On for Kittens is a fast-acting flea control solution designed specifically for young cats. This dual-action treatment is part of the award-winning 4 Fleas range and is exclusive to the pet trade. It effectively kills fleas on contact, eliminating the need for fleas to bite your pet. Technical specifications Active ingredient: 40mg Indicated for use in cases of flea allergy dermatitis Provides up to 8 weeks of protection Usage Stops fleas from biting in just 3 to 5 minutes Kills flea larvae within 20 minutes of contact in the surrounding area, including bedding and resting spots Eliminates 98 to 100% of fleas within 12 hours