Prevents reinfestation for up to 30 days. Kills fleas, ticks, flea eggs for up to 30 days. Sergeant's Gold Flea & Tick Shampoo for Cats & Kittens kills fleas and ticks while it cleans and deodorizes in one easy and convenient step. This rich conditioning, non-staining formula contains a highly effective flea and tick killing ingredient combined with an insect growth regulatory (IGR) that sterilizes new fleas and kills their eggs for 30 days. In case of emergency, call: 1-800-781-4738. Non-emergency, call: 1-800-224-PETS (7387). If you have questions or comments about this product, please write: Sergeant's Consumer Response, PO Box 540399 Omaha, NE 68154-0399.