Revolution is an easy–to–administer, all–in–one flea and heartworm treatment for dogs and cats that simply works inside and out for a full month. Revolution is extremely effective in keeping cats safe from adult fleas, flea eggs, flea larvae, as well as heartworm, intestinal worms and other nasties including ear mites & lice. It can be used in kittens from 6 weeks of age. Dosage and Administration: Once a month, simply squeeze Revolution out and onto the skin just in front of your cat or dog's shoulder blades. Two hours later, your pet will receive protection against fleas (including their eggs and larvae), heartworm, and other parasites for the next 30 days. In the event you bathe your pet two hours after applying Revolution, rest assured knowing Revolution will be unaffected, remaining completely effective.