Seresto Flea Collar Side Effects

Today we are going to take a long hard look at Seresto flea collar side effects and help you understand this product. Given that Seresto is a flea collar that works for 8 months, what are the active ingredients, and what are the potential effects it could have on your pet.


General Flea Collar Side Effects

Just as medications made for humans have side effects, chemical based products made for our pets, also contain a risk of side effects.

Common side effects of any flea and tick treatment include allergic reactions of hives, congestion, itching, extreme sensitivity, shock, respiratory distress, and death, although the last is very rare. Mild reactions include excessive salivation, paw flicking, ear twitching, mild depression, vomiting, and diarrhea.


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What are the Seresto Side Effects?

It is all good and well that flea and tick collars protect your pets, but what makes one better than the other. What are the Seresto side effects and how will they actually affect your pets? Can Seresto flea collar side effects be harmful to your dog? Will your beautiful cat be safe while wearing a Seresto flea collar? We will dive deep into all of these questions and more. Plus, if you have questions that we don’t answer, we’d love to hear from you so we can!


Looking for a Seresto Flea Collar Review


While putting this site together, we identified just how difficult it can be to find the best flea and tick collar. The market is absolutely saturated with choice and Seresto is yet another company providing a quality product. Whether you are looking for a flea collar for cats, or a flea and tick collar for dogs, the Bayer Seresto flea and tick collar choice is impressive!


What are Seresto collar side effects?

There is absolutely no doubt that a Seresto collar or Seresto dog collar is an excellent way to manage fleas and ticks but how does Seresto work? Is Seresto safe for our pets? It’s a completely natural question to have, because a Seresto collar is an external product that we are putting on a beloved pet, and we naturally want them to be safe.


How Fast Does Seresto Work? Find out Here!

So what are the side effects of Seresto flea collars? A close look at their product brochure shows that the Seresto side effects are pretty lethal to fleas and ticks. The Seresto collars are an 8-month flea collar and repel and kill ticks for 8 months (if used correctly). Their targets include deer ticks, American dog ticks, brown dog ticks, and lone star ticks. Fleas on the other hand, have an expected life of just 24 hours once the collar is applied and only 2 hours if they are a new infestation arriving on the animal. Wouldn’t you hate to be a flea or tick!


How Does the Seresto Collar Work Exactly? Should we be concerned about Seresto Flea and Tick Collar Side Effects

What is it within the Seresto Collar that has the power to act in such a way? And, given how well they work on fleas and ticks, can the Seresto flea and tick collar side effects be a concern for our animals?

Taking a closer look at the Seresto collar safety brochure and the Seresto collar warnings (click to read more in our Seresto collar reviews) and we see the active ingredients are listed as Flumethrin and Imidacloprid. These chemicals work together to create the incredible results produced by the Seresto Dog and Cat Collars. But if you are not a science expert, these names might not mean very much to you. So lets have a look at exactly what they are.


Looking for a Review of the Seresto Flea Collar Small Dog Product? Click Here


Active Ingredient Side Effects

Imidacloprid and Flumethrin


Flumethrin is a pyrethroid insecticide that is used externally in veterinary medicine against parasitic insects and ticks on cattle, sheep, goats, horses, and dogs.


Imidacloprid, on the other hand, is an insecticide that works as a neurotoxin, acting on the central nervous system of insects and has a very low toxicity to mammals.

But what does this mean for our pets and are there Seresto side effects to be concerned about? Well, yes and no. The real answer depends entirely on your animal and unfortunately, it is hard to truly assess Seresto safety prior to first use.

For the majority of animals, if there are any side effects of Seresto collar use, they will be minimal. Seresto dog collar side effects can include localized skin irritation, hair loss or rubbing from the physical collar. Such issues that are mirrored by Seresto cat collar side effects.

A Seresto collar allergic reaction can occur when you place your cat flea collar or tick collar for dogs on an animal that is allergic to the active ingredients. Seizures, diarrhea, and vomiting are possible, however, we must stress that these are extreme cases. For the majority of animals, Seresto flea collars are both safe and effective but how can you know if your pet is one of the unlikely allergic animals? Unfortunately, there really isn’t any way to know in advance if your pet is allergic. Close observation for a period of time after its application will certainly help you pick up on Seresto collar side effects before they get too serious.



Bayer Seresto Collar Warnings

What do Bayer Seresto tell us about their product? Do they provide warnings on the effects their products might have on our beloved pets?

We did extensive research into warnings by Bayer Seresto. To start with, the packaging contains a number of minor warnings, as can be seen in the images below.


Seresto Flea Collar Side EffectsSeresto Flea Collar Side Effects


The packaging clearly states that you should keep the product out of reach of children. It lists the active ingredients of Flumethrin and Imidacloprid, however beyond that, the exterior of the packaging is very limited in any mention of potential side effects.


Click to Enlarge – Seresto Flea Collar Side Effects


Bayer Seresto Collar Warnings continue inside the packaging, on their package insert, however again, the warnings are limited to minor skin irritations and some minor issues that should resolve within a few days to a few weeks of first use.


Looking for a Seresto Cat Flea Collar Review? Click Here


Dog Flea Collar Side Effects?

What are the Seresto Dog Collar Side Effects?

The Seresto dog collar ingredients can have side effects – so let’s look at the effect that a Seresto flea collar for dogs may have, starting with flumethrin side effects. If your dog does react to flumethrin, Seresto collar for dogs side effects may be varied. Side effects may include local dermatitis (skin irritation) with pruritus (itching) and erythema (red skin). Seresto lethargy is also a recognized symptom. Symptoms will depend on the dose, the formulation, and the kind of contact (skin, inhalation, ingestion etc). Flea and tick collar side effects of this nature are not common, however.

Side effects from Imidacloprid use can include fatigue, convulsions, lethargy and difficulty breathing. Unstable gait and tremors can also occur, but again, are rare symptoms and not common side effects of flea collars.

If you are looking for flea collars for dogs that work, then Seresto may well be the answer you’re looking for.


Looking for a Bayer Seresto Coupon? Click Here for More Information


Cat Flea Collar Side Effects

What are the Seresto Cat Collar Side Effects?

Seresto flea collar for cats side effects are similar to those of the Seresto collar for dogs side effects. It is important to realize that when using Seresto for cats in accordance with the instructions, Bayer Seresto collar side effects should be minimal. Compare the effectiveness of using flea collars on cats against any possible side effects. Which outcome is more valuable?

It’s also important to think about the consequences v’s the small chance of side effects. Compare the effectiveness of using flea collars on cats against any possible side effects. Which outcome is more valuable?



As with anything in life, a treatment is only useful if it is effective. Not treating for fleas and ticks will cause issues that far outweigh those possible using a Seresto flea collar. The purchase of a Bayer flea collar will provide many months of protection. Furthermore, Seresto collar side effects are unlikely to cause any significant concern, Seresto is widely recognized as one of the best flea and tick collar for cats

For cat lovers, the Seresto collar for cats is an excellent choice. Your cat will enjoy many months of protection and you need not worry about those annoying fleas. In our opinion, despite the small chance of Seresto side effects in cats, this makes it the best flea collar for cats.

For dog lovers, the Seresto flea and tick collar for dogs is a quick, easy and affordable choice. Therefore, it is a decision that will keep your pooch, happy and healthy, and make you one very happy owner!


Where to Buy a Seresto Tick Collar

If you are looking for the Seresto flea and tick collar best price – there are many places to find them.

For best prices on Seresto Collars, we recommend Seresto Flea Collar Amazon! Click here for big savings on Seresto Dog Collars and click here for the best prices on Seresto flea and tick collar for cats

Another great option is to check out the Seresto Flea Collar Petsmart offers! Petsmart have a great range of products and some great discounts. They often have a Seresto Collar Coupon to help save even more money!


Seresto Flea Collar Rebate

Did you know that Seresto products often come with a rebate, to help you save money on this incredible product? To get your Seresto refund, click here for full details and find out how to claim the Seresto Collar Rebate! No need to contact Seresto Customer Service – we have all the details you need here – Seresto Flea Collar Rebate Bayer!


Do you have more questions about Seresto?

If you do, check out our Seresto Collar FAQ page!