Beaphar Fiprotec Combo Spot On for Cats contains fipronil and the insect growth regulator S-methoprene. It which not only kills adult fleas, ticks and biting lice, but also interrupts the flea life cycle, preventing any exposed eggs and/or larvae from developing in your home for up to six weeks. Fiprotec Combo Spot On for Cats kills adult fleas for up to four weeks and ticks for up to two weeks. Suitable for cats over 8 weeks of age and weighing more than 1kg. Suitable for pregnant and lactating queens. Cats who spend a lot of time outside are especially at risk from fleas and ticks, but indoor cats should still be treated regularly to avoid a flea infestation. It is important to establish a regular flea control routine for cats and the household.