Starts killing fleas and ticks in as little as 1 hour, and continues to kill for 1 month. * Prevents and controls reinfestation of listed pests for 30 days. * Kills ticks that may transmit lyme disease, rocky mountain spotted fever, ehrlichiosis, babesiosis, and anaplasmosis. * Kills brown dog ticks, american dog ticks, lone star ticks and deer ticks in as little as 1 hour.