Can Seresto make my cat sick

No, Seresto is safe and proven to be effective in controlling fleas and ticks on cats. The active ingredients, imidacloprid and flumethrin, are used in flea and tick protection products sold around the world and have an excellent safety record.

Seresto is also designed with your cat’s safety in mind, as it has odorless components that create a long-lasting barrier of protection. To further ensure your cat’s well-being, there is no need to keep the collar tight; it will still remain effective if it can move 2 finger widths when pulled.

As always, if you have any specific questions or concerns about how Seresto affects your cat’s overall health or potential reactions to the product, you should speak to your veterinarian for personalized recommendations before use.

Allergic Reaction

An allergic reaction is one possible side effect of using Seresto on cats. The active ingredient in Seresto is an insecticide called imidacloprid and it has a potential to cause skin irritation and mild discomfort in cats. If your cat has a history of allergies, you should consult your veterinarian before using this product as it may trigger an allergic reaction.

Signs of an allergic reaction include extreme itchiness, swollen eyes or face, hives, rashes, vomiting, lack of appetite, diarrhea or difficulty breathing. If your cat displays any of these symptoms after application, immediately remove the collar and bathe them with a mild cleanser to clean off any remaining traces of Seresto on their body. Call your vet as soon as possible and make sure to bring the collar with you when you visit so they can identify what may have caused the reaction.


Vomiting is one of the most common side effects of Seresto, at least according to customer reviews. As cats can suffer from nausea or motion sickness when wearing a flea collar, it’s not surprising that some cats vomit after using Seresto.

However, there are other possible causes for vomiting too. Cats can vomit simply because they ate something that disagree with them or because they have an upset stomach. To rule out any underlying medical conditions, you should take your cat to the vet if vomiting persists after using the flea collar.

Most veterinarians will recommend closely monitoring your cat when starting a new treatment like Seresto and keeping an eye out for any signs of distress or discomfort. If your cat begins to vomit frequently while wearing the Seresto flea collar, it may be best to remove it and consult your veterinarian before trying any other method of flea control.


When it comes to side-effects from using Seresto on your cat, diarrhea is one of the most common problems. Many cats experience a sudden onset of watery stools after having the flea and tick protection applied. If your cat is experiencing diarrhea, you should take them to the vet as soon as possible to ensure that they don’t have an underlying health condition like an allergy or infection.

It’s important to note that Seresto is not known to cause long-term damage if your cat experiences an episode of diarrhea as a result of its application. However, if the symptoms persist or worsen, it may be necessary to adjust dosage levels or seek further treatment with your veterinarian. Additionally, be sure to monitor your cat for signs of other adverse effects such as lethargy, loss of appetite, nausea, vomiting, excessive salivation and trembling. Cat owners should always follow their veterinarian’s instructions for proper product use and dosage strength when applying Seresto flea and tick products onto cats.

To conclude

While most cats have not experienced any adverse reactions from Seresto treatments, it is important to be aware of the potential side effects that your cat could experience in order to take proper precautionary measures.

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