Kills fleas, flea eggs and larvae, and ticks (including those that may transmit Lyme disease). For cats weighing 1.5 lbs or more. I used 3 out of the 6 doses, and I’m switching medications, so I am selling the remaining 3 doses at a reduced price. I can attest that this works way better than Frontline plus and Pet Armour! It prevented tiny, newly hatched ticks from attaching to the area around my cat’s eyes. I’m only switching meds because I need one that also includes heart worm protection. Box is opened, but the remaining doses are unopened! Please message me if you have any questions!