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Seresto® flea collar for cats

Fleas can quickly become a problem for you and your cat if you don’t stay on top of things. But it’s easy to forget to give regular, monthly treatments. The Seresto collar for cats keeps your pet protected for 8 months at a time.

The Seresto cat collar kills fleas through simple contact, which means the fleas don’t have to bite your cat before they’re killed. Your cat will constantly receive reliable flea prevention and protection. By simply putting a Seresto flea collar on your cat, you’re preventing parasites from biting, reducing the risk of infections and transmission of flea-borne diseases. In short, Seresto is the easy and long-lasting way to help your cat stay happy and healthy.

Why Seresto? 

  • Effective for 8 months
  • Kills fleas without the need for a blood meal
  • Water-resistant^
  • Odour-free

How does Seresto work?

At first sight, Seresto might look like just another pet collar, but it’s far from ordinary. Unlike other flea collars, Seresto contains two active ingredients called imidacloprid and flumethrin that are released in low doses and spread throughout your cat’s skin and fur from head to tail. The collar creates an invisible layer of protection that kills fleas that come in contact with your cat.


How to apply
How to apply

Remove the Seresto collar from the pouch. Remove any remaining plastic connectors on the inside of the collar. Put the collar around your cat’s neck and

insert the loose end into the two loops. Cut off any extra collar length, leaving about 2 cm of the loose end beyond the second loop.

Make sure the collar is neither too tight nor too loose. Ideally, two fingers should fit between the collar and your cat’s neck.


What is Seresto?

It’s an innovative collar that protects your dog from ticks for four months and fleas for eight months. This means your pets are protected for longer and you have less chance of forgetting to give them their protection.

What makes Seresto different from other flea collars?

Innovative technology enables the collar to release controlled, safe doses of its active ingredients over long periods of time. These are transferred to your cat’s skin and fur, and spread across your cat’s entire body to keep your cat protected from fleas and ticks for eight months. 

What are the active ingredients in Seresto?

There are two: imidacloprid, which kills adult fleas on your cat and flea larvae in their environment, and flumethrin, which repels and kills ticks. Both ingredients act on contact without the need for fleas or ticks to bite to be killed.

How long does Seresto for cats take to work?

Seresto kills existing fleas on cats within 24 hours of application. Once Seresto has been on your cat for 24 hours, re-infesting fleas are killed within two hours. Once Seresto has been on your cat for 48 hours, re-infesting ticks will be rapidly repelled and/or killed. In the case of paralysis ticks, most are repelled and drop off the cat without biting, within 6 hours of coming into contact with a cat wearing Seresto. These ticks will go on to die.

My pet has started chewing the collar. Should I be worried?

As the vast majority of active ingredients are bound within the collar matrix and are not on the surface, they are not released or absorbed when the collar gets chewed. Nevertheless, you should prevent your cat from chewing the collar. Check to make sure the collar is not too loose. If the collar is chewed, your cat may experience mild gastrointestinal upset. If this occurs, please call 1800 678 368 to speak to a vet or vet nurse on our customer care line.

When can I put the Seresto collar on my kitten?

Seresto collars can be used on kittens from 10 weeks of age. If younger kittens need flea control, they can be treated with Advantage for Cats and Kittens from birth.

Should I leave a gap between taking off an old collar and putting on a new one?

Replacing your cat’s Seresto collar immediately after removing the expired collar will ensure continuous protection against fleas and ticks.

My Seresto collar doesn’t smell at all. Does this mean it’s not working properly?

Not at all. Seresto is odourless, which means you don’t have to put up with any of the unpleasant smells you usually associate with older collars.

Can the Seresto collar be used alongside normal collars?

Absolutely. Always place the Seresto collar next to your cat’s normal collar, so that it is in direct contact with the skin or hair.

My cat is scratching at the collar, causing redness and irritation. What should I do?

Although uncommon, there is a chance that your cat might develop mild reactions such as scratching, redness and hair loss under the collar. These symptoms usually occur within the first one to two weeks of collar application and resolve soon after, without removing the collar, as your cat gets used to wearing it. In some cases, temporary collar removal may be recommended until the symptoms have disappeared. In the unlikely event that your cat develops any of these symptoms, please call 1800 678 368 to speak to a vet or vet nurse on our customer care line.

What happens if my cat gets her collar stuck on something?

Seresto is designed with a double safety-release mechanism. In the unlikely event of your cat being trapped, the collar will widen or open, allowing for a quick release. The collar is also equipped with a predetermined breaking point for additional safety.

How often should I check the fit of the Seresto collar on a growing kitten?

Kittens grow at different rates, and we recommend checking the collar daily or every second day and readjusting if necessary. 

How should I dispose of a Seresto cat collar?

Used collars or any remnants should be disposed of according to the label.

Pet Type
Approval Code
PD - 01730
Master Brand
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