The all in one parasitic control. Action: kills fleas, flea eggs & larvae, plus heartworm, kills ear mites & sarcoptic mange Re-apply: monthly How to use: apply contents of squeeze tube directly onto skin at the back of the neck For: dogs over 6 weeks of age Formulation is non-greasy & is water safe after 2 hours. Note Dogs should be tested Adult Heartworm Clear before giving this medication. Highly recommended.