Stronghold Blue 6 for Cats between 2.6 - 7.5 kg (5.7-15.5 lbs.)45mg, works quickly and for one whole month after a single application. 6 doses will give your adorable little fur ball all the help it needs in the fight against both internal and external parasites, such as: Fleas--adults, eggs, and larvae Heartworms Intestinal worms—hookworm and roundworm Ear mites Biting lice This powerful topical boasts a variety of usages, and requires very little effort on your part to keep your cat at a healthy level of frisky curiosity, or apathetic lethargy. It just depends on that testy tabby’s mood. Wait at least 2 hours after treatment to bathe your cat.