We treated our 2 cats with a generic Advantage 2 a week ago. We just received our Revolution in the mail. How soon can we apply the Revolution for their flea infestation? They're 5lbs, and 6lbs. 5 mos old. Pet's info: Cat | Maine Coon | Male | neutered | 5 months and 9 days old | 5 lbs

Great question! According to the package insert for Advantage 2, you can safely reapply once every two weeks, so it would be fine to give them the Revolution now. You can also give them Capstar. It's a one time pill that starts killing fleas in 30 minutes and is safe to give with the Revolution. Don't forget you will need to disinfect the environment as well. Wash their bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. I hope this helps!

Revolution will start working 12 hours after application, but it will take 24 hours before all the fleas are killed. As long as your cats have flea protection as well, the fleas will not affect them. You can also give your cats and the stray cat Capstar. It's a one time pill that starts killing fleas in 30 minutes, and it's safe to use now. If he doesn't have a home, you may have a new member of your family :-)