FRONTLINE Spot On for Cats is the original formula from the UK's leading flea and tick brand. It kills fleas and ticks on your cat to help protect them from the discomfort and diseases these parasites cause. Use it every 4 weeks for optimal protection. FRONTLINE Spot On is a clinically proven veterinary medicine that's available in 1-dose, 3-dose and 6-dose packs. It kills fleas on your cat within 24 hours and ticks within 48 hours, helping to reduce the risk of tick-borne disease. It also kills lice. FRONTLINE Spot On is a topical treatment which goes over your cat’s skin and hair to kill fleas and ticks through contact with them. Bathing/shampooing/water exposure once a week does not affect the product's effectiveness, but do not bathe your cat for 2 days after application. It can be applied to cats from 8 weeks of age that weigh at least 1 kg and can also be used on pregnant and nursing cats. FRONTLINE Spot On for Cats is not suitable for use on rabbits. Active ingredients: fipronil, s-methoprene.