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The Seresto collar protects cats against fleas and ticks for up to 8 months from a single 38cm collar, releasing imidacloprid and flumethrin slowly into the skin and coat.
Made for cats and kittens over 10 weeks old
This item requires a current prescription from your vet before we can dispatch it. The good news? Sorting it out is simple and only takes a moment.
As soon as your prescription reaches us, our team will verify the details and get your pet’s treatment posted out to you.
The Seresto collar protects cats against fleas and ticks for up to 8 months from a single 38cm collar, releasing imidacloprid and flumethrin slowly into the skin and coat.
Made for cats and kittens over 10 weeks old
Seresto flea and tick collar for cats
The Seresto cat collar is made from a polymer matrix (a flexible plastic base that holds the active ingredients and lets them out gradually). It releases its two active ingredients slowly and steadily onto your cat’s skin and coat, and they spread over the whole body. Levels stay high enough to kill fleas for 7 to 8 months and ticks for 8 months.
Imidacloprid kills adult fleas and flea larvae (it blocks nerve signals in the flea, causing paralysis). Flumethrin kills ticks and repels them, which helps stop them biting (it disrupts the tick’s nerve cells).
Fleas start dying as soon as the collar goes on (activity starts straight after fitting). Protection against new ticks starts within 2 days (most die within 24 to 48 hours, before they feed).
One collar in place of monthly treatments
A single Seresto cat collar covers fleas for 7 to 8 months and ticks for 8 months. There’s no monthly spot-on or tablet to remember, and no mess, greasy patch or smell on your cat’s coat. Leave it on all the time for the full period.
How the safety release works
If the collar gets caught, a ratchet-release lets it widen, giving your cat room to slip free. It also has a built-in breaking point and will snap if enough force is applied.
Water and bathing
Seresto Cat Collar is water-resistant and keeps working if your cat gets wet. With monthly shampoos or soaking, tick protection still lasts 8 months, but flea protection starts to fade from the fifth month.
New recyclable Seresto cat collar pack
The Seresto cat collar now comes in a moulded fibre carton made from FSC-certified fibres, in place of the old tinplate steel tin. Elanco puts the saving at 70% less carbon dioxide for the packaging. The carton and outer cardboard sleeve both go in your recycling, and the collar and its sealed inner pouch haven’t changed.
Warnings and restrictions
No prescription needed. A vet, pharmacist or SQP must be satisfied it suits your cat before we supply it.
Remove any ticks already on your cat before fitting.
Ask your vet or pharmacist if you’re unsure how to fit it.
The Seresto cat collar comes in one size: 38cm, for all cats. Each pack contains one collar, sealed in its own bag.
Seresto dog collars are a different product.
Don’t use a dog collar on your cat.
Seresto cat collar specification
| Brand | Seresto by Elanco |
|---|---|
| Size | 38cm, one size for cats and kittens from 10 weeks |
| Route | Cutaneous use (worn on the skin and coat) |
| Starts working | Fleas straight after fitting, new ticks within 2 days |
| Flea protection | 7 to 8 months |
| Tick protection | 8 months |
| Flea larvae around your cat | Stops development for 10 weeks |
| Water | Water-resistant |
| Shelf life | 5 years unopened |
Active ingredients
Per 38cm collar: imidacloprid 1.25g and flumethrin 0.56g
Other ingredients
Also contains titanium dioxide (E171), iron oxide black (E172), dibutyladipate, propylene glycol dicaprylocaprate, epoxidised soybean oil, stearic acid and polyvinyl chloride.
No prescription needed for this item. A vet, pharmacist or SQP checks every order before it’s supplied.
Legal category: NFA-VPSPick the weight band or pack size you need, then add to basket.
Delivery method, billing, payment. Free standard delivery over £50.
Royal Mail Standard (2–3 working days) or 24 First Class (1 working day). Unbranded, secure packaging.
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