Best flea treatment for cats 2021: Vet-approved collars, spot-on and oral solutions

Fleas can be a problem no matter how clean your home is, so it’s important to ensure that your feline friends are fully protected from the tiny insects.According to Caroline Reay, head of veterinary services at Blue Cross, it can be easy for your cat to pick up fleas, even if they live indoors, as the wingless creatures can jump up to 100 times their body length and “can be easily brought into the house on shoes, clothing or other pets”.As with most things, prevention is better than cure, but if you’re concerned your cat might have already picked up fleas there are some key signs to look out for. Dave Tweedle, veterinary surgeon at My Family Vets, says it is possible for a cat to have fleas “without you ever seeing a single one”, but symptoms can include scratching, hair loss, restless behaviour, biting, excessive grooming and flea dirt on the fur or skin.

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It’s vital that you catch fleas as early as possible because, while they may be small, they can cause serious harm to your feline friend if left untreated. When a flea bites your cat and its saliva enters the bite wound, some can suffer an allergic reaction, Tweedle says, explaining that in some cases sores can develop on their skin, which often become infected. What’s more, “kittens, elderly or sick cats can become weak and anaemic as a result of blood loss”. Fleas can also spread nasty diseases and are a common cause of tapeworms.

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When it comes to buying treatments, there are a multitude to choose from, but Nina Downing, a vet nurse for the People’s Dispensary for Sick Animals (PDSA), recommends purchasing products from reputable retailers “as they tend to be safer and more reliable for your pet”.
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She adds that looking for solutions marked as “NFA-VPS” is a good idea too, as this means they can only be sold by someone (usually a vet, pharmacist or suitably qualified person) who knows about the products and can confirm your pet is healthy and receiving the right dose. “These will tend to be stronger than products that you can pick from a shelf,” Downing explains. “If you buy a NFA-VPS product, it’s likely that you will be asked the weight of your pet beforehand.”

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It’s also important to consider which method will suit your cat’s temperament best. “Choose whatever will be the least stress for you both,” Reay says. “If your pet easily takes tablets in food, then choose those, otherwise go for a spot on and use food or treats as a distraction while it’s applied. The calmer you are, the more you’ll help to reassure your pet.”

So, what are the main types of flea treatment worth investing in? To find out, we spoke to leading veterinary practitioners. From spot-on solutions to collars and techniques to treat your home, these are the best ways to keep your living space free from critters.

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Topical flea medication or spot-on treatments

One of the most popular types of flea treatments are spot-on or topical solutions, which “are applied to the skin on the back on your cat’s neck and work by the active ingredients being absorbed through the cat’s skin into their body”, says Downing. These treatments kill fleas living on the cat and will also prevent future infestation for a while after they’ve been applied.


If this type of treatment sounds like it could work for your feline, Downing recommends opting for Frontline’s spot on flea and tick control for cats (£10.99,, which says it kills fleas on your pet within 24 hours and will continue to protect them for up to a month.

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(Flea Screen )
Alternatively, she suggests investing in Flea Screen Combo’s spot-on solution (£11.99, which is a UK-veterinary-licensed flea and tick treatment for cats and kittens from eight weeks old. The treatment is available in one size for cats weighing 1-8kg.

Flea collars

Flea collars work by having an active ingredient embedded within, which is released when the collar comes into contact with your pet’s skin. Tweedle says it is important to “pick a flea collar that will release if your pet is caught by them and trapped, as otherwise, they can be dangerous”.

This Seresto flea and tick collar (£33.95, is an NFA-VPS product and delivers up to eight months’ continuous protection. The brand says it can provide such long-lasting defence because the collar releases its active ingredients at a slow and steady rate. It’s also water-resistant and odour-free.

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If you’re concerned about the quality of a flea collar, Downing suggests speaking to your vet or vet nurse for advice on the best option for your cat.

Oral treatments

Another option is to give your cat an oral treatment, which comes in the form of a capsule or tablet. Tweedle says “flea tablets work by the active ingredient being absorbed from the gut and taken into the bloodstream, which then kills fleas when they bite your pet”.

Before purchasing an oral treatment, it’s important to know that different medications use different chemicals, with some working very quickly but only lasting for a few days, and others working over several months.

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A great solution for owners who struggle to apply topical treatments or for cats that have sensitive skin which reacts to spot-on products, VetIQ’s flea guard tablets (£9, contain a blend of B vitamins, yeast, zinc and garlic, which the brand says help to make your pet’s blood less palatable to fleas, ticks and mosquitoes.

Flea treatments for your house

With your cat taken care of, Reay says it is “really essential to treat the house as well”. She recommends using a vacuum first to get the eggs (which are very resistant to chemicals) to hatch and then use a spray.

The PDSA has its own household flea spray (£9.99,, which kills both existing fleas and their eggs, ensuring the flea life cycle is properly broken. The spray claims to prevent the development and growth of flea eggs and larvae in the home for up to six months and can also be used to target other pests such as cockroaches and silverfish.

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You can also pick up this Virbac indorex defence household flea spray (£8.99,, which kills adult fleas and house dust mites for up to two months after application. When using, hold the can at arm’s length and direct the spray towards the area you want to treat.


Whichever product you choose, Reay adds that it’s vital to follow the directions on the can carefully and to always “air the room before you allow your pet (or yourself) back in”. This is because household flea treatments can be particularly toxic to cats, so make sure they don’t sneak back into the treated area before it’s dried.

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