ZoGuard Plus for Cats is the perfect solution to help protect your cats against fleas and ticks. It uses Fipronil and S-Methoprene (insect growth regulator) as its active ingredients (same as leading competitor, FRONTLINE Plus) which effectively kills fleas, ticks (including those that may transmit Lyme disease) and chewing lice. It also prevents flea eggs and flea larvae from maturing by breaking its cycle. ZoGuard features a sustained release formula which was developed to offer quick and long-lasting control, but with better value for the money. Product comes with three 0.50 ml (0.017 fl oz) applicators and is ideal for cats and kittens over 8 weeks of age and weighing over 1.5 lbs. Contains 3 month supply.