(Star Horse) Provides 5-way protection against fleas, flea eggs and larvae, ticks, mosquitoes and lice. Contains 50% Permethrin to kill and repel ticks for up to 6 weeks, fleas up to 5 weeks, mosquitoes, lice and mites up to 4 weeks. Insect growth regulator Nylar breaks the flea life cycle by working for up to 8 weeks. Do not use on puppies less than 12 weeks of age. Do not use on cats.