Advantage Spot-On Flea Treatment for Cats and Kittens Under 4kg is a monthly topical flea treatment for the smaller cat weight band. The 6-pack gives six months of flea protection and uses imidacloprid as the active ingredient.

Applied topically to the back of the neck, Advantage kills 98 to 100% of fleas within 20 minutes of exposure and stops reinfesting fleas from biting within about five minutes. It also kills flea larvae in the cat's environment, which helps reduce ongoing re-infestation, and can reduce the incidence of flea allergy dermatitis in cats that react strongly to bites. The formula is water-resistant, so short baths or a wet day don't wash it off, and it's safe on kittens from birth as well as on pregnant and lactating cats.

Advantage is a flea-only product, which suits households that already use separate products for worming and paralysis tick coverage where relevant. The under-4kg dose is the most commonly restocked pack for kittens and small adult cats.