A Pfizer study published in Veterinary Parasitology in 2000 looked at the "efficacy and safety of selamectin against gastrointestinal nematodes in cats presented as veterinary patients." 202 cats affected with roundworms and/or hookworms were treated with topical Revolution flea control at normal doses (6mg/kg). Parasite kills were excellent and side effects were not remarkable.
Protect Your Cat and Home from Fleas - Pets WebMD
There are many brands of medicated shampoos that kill fleas on contact. It is very effective in the short run and will kill all the adult fleas on the cat. Typically the fleas will run to the dry head of the cat and can be picked up. Alternatively a ring of wet sudsy shampoo can be made around the neck before the cat is immersed in water thus creating a barrier.
Flea Control: Keep Fleas Out of Your Cat's Life and Yours
Typically the flea shampoo gets washed off as the cat is thoroughly rinsed off. Very little insecticide remains on the cat. Gloves should be worn. It may be necessary to regularly shampoo to kill newly emerged fleas.
8 Ways to Naturally Treat Fleas on Cats | petMD
These liquids are typically applied on one area of your cat and can last for a month before having to be reapplied. Many can start killing off fleas in as little as 12 hours. Topical flea treatments for cats include , and . A healthy energetic cat grooming properly can get rid of 50% of its fleas. Not bad. Older and younger cats are not so successful. It is possible that they don't have the skills, or the energy to be as successful.