3 month supply. For use only on cats & kittens of all weights over 12 weeks of age. Starts to kill fleas & ticks in as little as one hour! Kills fleas. Kills ticks. Kills chewing lice. Waterproof. Prevents and controls reinfestation. Starts to kill fleas and ticks in an hour, continues to kill for a month. Prevents and controls reinfestations. Controls the flea reinfestation for up to six weeks. Kills fleas that may cause flea allergy dermatitis, flea bite anemia, and tapeworm infestation. Kills deer ticks (which may transmit Lyme disease) for up to 4 weeks. Kills brown, American and lone star dog ticks for up to 4 weeks. Fast action against chewing lice infestations. Fast-acting, long-lasting. Sergeant's Pronyl OTC Max for acts contains fipronil and etofenprox to effectively kill fleas, ticks and chewing lice. The active ingredients in Sergeant's Pronyl OTC Max for cats feature a sustained-release formula developed for fast-acting and long-lasting control of fleas, ticks and chewing lice for 30 days on cats. 6 Step Topical Checklist: Read the label completely and follow directions. Weigh your pet. Do not use dog products on cats. Do not treat with more than one pesticide product at a time. Separate animals after treatment to avoid chance of ingestion. Do not split tubes between pets.