Comfortis Killed My Cat?

When I searched online ”Comfortis killed my cat”, I encountered the following heart-breaking story in a feline forum.

When I gave my cat Comfortis, I never thought it would be the last time I saw her alive. She was always such a healthy cat, and I had no reason to believe that this flea medication would kill her. But that’s exactly what happened. If you’re a cat owner, then you know that Comfortis is a medication used to kill fleas. But what you may not know is that this medication can be deadly for cats. Just last week, my cat died after taking Comfortis and I want to warn other pet owners about the dangers of this drug”.

This is truly a sad story. But can Comfortis kill a cat? We will answer this question along with other things related to Comfortis and cats. Let’s start with the most important question:

Is Comfortis Toxic to Cats?

Comfortis is a flea medication for dogs. It is not toxic to cats, so your cat can safely take the medication if you choose to do so.

However, there are some side effects that your cat may experience when taking Comfortis. These include lethargy, weight loss, vomiting, diarrhea, anemia, and more. It’s important to be aware of these potential side effects before administering the medication to your cat.

Is Comfortis for Cats Discontinued?

No, Comfortis for cats is not discontinued.

What Are The Precautions Before Administering Comfortis to Cats?

  • The recommended dose for cats is a single chewable tablet given orally.
  • The use of Comfortis for cats is not recommended for kittens less than 14 weeks of age or weighing less than 4.1 pounds.
  • The drug can be given every 30 days, or monthly, to maintain flea control.
  • Do not give Comfortis to animals with pre-existing seizures, as it may cause them to occur more often.
  • If your cat has a history of neurologic disorders or other health issues, talk with your veterinarian before giving this medication.

Why is My Cat Acting Weird After Administering the Comfortis?

If your cat is acting strangely after administering Comfortis, it could mean that the reaction is not to the drug but to fleas. This is actually a good sign! It means that the drug is working, and the fleas are dying off. You should keep your cat inside for at least 24 hours after administering the pill so that she does not get re-infected by fleas outside.

Can Cats Be Poisoned by Flea Treatment?

While it is possible for cats to be poisoned by flea treatment, it is not common. The most likely scenario in which this would occur is if the cat licked the treatment off of their fur after it was applied. Ingesting enough amount of some flea treatments can cause serious health problems in cats, and even death.

If you suspect that your cat has been poisoned by flea treatment, contact your veterinarian or emergency animal hospital immediately. Symptoms of poisoning include vomiting, diarrhea, seizures, and difficulty breathing.

What are the Side Effects of Comfortis for Cats?

There are a variety of side effects that have been associated with the use of Comfortis in cats. These side effects can range from mild to severe, and in some cases, they can be fatal. The most common side effect reported is vomiting, which can occur within minutes to hours after administration of the drug.

Other common side effects include diarrhea, lethargy, loss of appetite, and increased thirst. In rare cases, more serious side effects have been reported such as seizures, collapse, and death. If your cat experiences any of these side effects after taking Comfortis, it is important to seek immediate veterinary care.

How Long Does the Side Effects of Comfortis Last in Cats?

The side effects of Comfortis can last anywhere from two to five days, depending on the individual cat. Some cats may experience side effects for longer, while others will recover much sooner.

If you notice that your cat is still feeling ill, it’s important to contact your veterinarian right away.

What if My Cat Vomits Within an Hour After Administering Comfortis?

If your cat vomits within an hour after administering Comfortis, it’s a good idea to give them another dose.

The Comfortis tablet often dissolves quite quickly, but Elanco reps have said that if a cat vomits within an hour of medication administration, the cat should receive another dose. To confirm this information and to report Clair’s vomiting, I recommend calling the phone number on the Comfortis packaging.

Lauren Jones VMD

Find Out Whether Other Things That Can Kill Your Cat


Comfortis is a flea medication that comes in tablet form. It’s given to cats for the treatment and prevention of fleas. The medicine kills the fleas on your cat, preventing them from biting and infecting your pet with tapeworms or other parasites. If you’re thinking about giving this medicine to your cat, here are some things you should know:

If you have a kitten who weighs less than 4.1 pounds and than 12 weeks old, do not give them this medicine unless your vet recommends it. Kittens under 4.1 pounds should not be given Comfortis because they aren’t old enough to receive it without risking serious side effects, like seizures.

The manufacturer also advises that if your cat has an allergy to the ingredients in Comfortis, you should not use it.

If you do decide to give your cat Comfortis flea control tablets, be sure to follow all instructions carefully and watch for any side effects.

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