Frontline Spray is a long-lasting flea treatment. It kills about 98-100% of fleas on cats and kittens within 24 hours. One application kills and prevents fleas for up to 8 weeks in cats. Eliminating heavy flea infestation, Frontline Spray prevents flea allergy dermatitis. For paralysis tick control on cats use FRONTLINE SPRAY every 3 weeks. Consult your vet prior to using this product in breeding, pregnant and lactating queens. The spray on flea control formula is safe to use on kittens from 2 days of age.