Advocate Purple for Large Cats over 4kg. It is an easy to use, monthly spot-on treatment that protects your cat from fleas, heart worm, intestinal worms and other nasty parasites. It kills adult fleas and their larvae within 20 minutes of application to break the flea life cycle and prevent reinfestation. Safe for use in kittens from 9 weeks of age. Although, the safety of Advocate has not been established in pregnant and lactating queens.