Frontline Plus for cats kills fleas on your cat in as little as 24 hours, also eliminating ticks and lice. But what makes it the most advanced Frontline formula yet is its IGR technology, which stops the eggs from hatching and infesting your pet or your home again. For maximum protection, apply every 4 weeks, all year round. Packs of 3 or 6 doses are available to help you get organised.