If you’ve just found fleas on your cat, you probably want to know what to buy and how soon it will work. The confusing part is that flea treatments for cats do different jobs. A tablet that kills the fleas on your cat today may offer very little protection tomorrow, while a monthly treatment may also cover parasites you weren’t thinking about. Knowing that makes the choices easier to sort through.
Before you compare brands, check your cat’s current weight and age. Those details determine which package is appropriate, even within the same product range. Your vet will also need to know about other medications, previous reactions to flea treatments, and any history of tremors or seizures. A kitten or a cat who is ill, pregnant, or nursing needs advice specific to them before you choose a product.
Revolution Plus is a prescription treatment applied to the skin once a month. Along with fleas, it covers heartworm prevention and the tick species listed on its label. It is labeled for cats at least eight weeks old and weighing at least 2.8 pounds. If your vet recommends protection against several parasites, this is one option that combines those jobs in a single treatment.
It contains sarolaner, an ingredient in the isoxazoline family of medicines. These carry a warning about possible tremors, loss of coordination, and seizures, including in pets without a previous history. That warning is part of deciding whether it suits your cat, rather than a reason to assume every cat will have a problem. Its safety in breeding, pregnant, or nursing cats has not been established.
Advantage II for cats is also applied to the skin monthly, but you can buy it without a prescription. It kills adult fleas, eggs, and larvae, and is labeled for cats at least eight weeks old and weighing at least two pounds. It does not provide heartworm or tick protection, so those needs have to be considered separately. Check the full name and weight range when you shop; other products in the Advantage range have different ingredients and uses.
Capstar is an over-the-counter tablet that starts killing adult fleas within 30 minutes. It can help when there are fleas on your cat now, but its effect is short-lived. It does not provide a month of prevention or kill the eggs and larvae developing around the house. The cat tablet is labeled for cats at least four weeks old and weighing 2 to 25 pounds. If you are considering it, ask your vet how it fits with anything your cat has already received and what to use for ongoing control.
Whichever treatment you choose, use a product labeled for cats and follow its directions. Never use a dog-only flea treatment on a cat, even in a smaller amount. Some dog treatments contain permethrin, which is highly toxic to cats, and contact with a recently treated dog can also cause poisoning. Keep pets apart until topical treatments dry, or longer if the label requires it. If you suspect exposure or your cat becomes unwell after treatment, contact a veterinarian immediately and have the packaging handy. The FDA’s guidance on flea products explains these precautions.
Once you have treated your cat, finding another flea a few days later can make you wonder whether any of it worked. Fleas developing in bedding, carpets, and furniture can keep emerging after treatment begins. That does not automatically mean you chose the wrong product. It does mean the home needs attention alongside the cat, and adding another medication or giving a dose early is something to check with your vet first.
Wash pet bedding and vacuum floors, rugs, upholstered furniture, and the places where your pets spend time. Every pet in the household needs appropriate flea control, even if you have only noticed fleas on one of them. The CDC says moderate to severe infestations can take months to control, so expect to keep cleaning while you follow the treatment schedule. An established infestation may also need a licensed pest-control professional. Products intended for the house or yard should never go directly on your cat.
This applies to indoor cats too. Fleas can get into a home and continue developing there through colder weather. The Companion Animal Parasite Council recommends year-round flea control, including for cats who stay indoors. A flea comb can help you check the coat and remove fleas, but it cannot clear an infestation by itself. Work out a prevention schedule with your vet that you can keep following once the visible fleas are gone.
If you are leaving town, include flea treatment in the information you give your sitter. For our cat-sitting visits, we need the product name, the date it was last given, and when the next dose is due. Please tell us about an active flea problem before visits begin so we can discuss the care and any cleaning you are requesting. Knowing what has already been done helps us follow your instructions and report anything that needs your attention.
If a dose falls during your trip, we will need to review the instructions and confirm the arrangements beforehand, just as we do with other medications. Leave the product in its original packaging and make sure the written instructions match your vet’s current directions. If you give a treatment just before leaving, update the date in your care notes so your sitter has the same information you do.