Johnsons 4Fleas Tablets for Cats and Kittens, 6 Treatment Pack, 14D083To kill fleas on cats and kittens from 4 weeks of age. No contra indications Safe to use with other flea and worm treatments, leaves no residue on their coat or in the home Each tablet kills any fleas on cat within 24 hours Tablet can be given whole or mixed into food If you notice any serious effects or other effects not mentioned in the instructions, please inform your veterinary surgeon