3 month supply. For dogs only weighing more than 7 lbs and less than 33 lbs over 12 weeks of age. Breaks flea lifecycle. Kills fleas; ticks; mosquitoes; flea eggs; flea larvae. If you have questions or comments about this product, please write: Sergeant's Consumer Response, PO Box 540399, Omaha, NE 68154-0399. In case of an emergency, call: 1-800-781-4738; non-emergency, call 1-800-224-Pets (7387).