Capstar Killed My Cat?

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

We recently had to put our cat down after she became very ill. We had tried everything we could think of, but nothing was working. One of my friends suggested we try Capstar, a medication that is supposed to kill fleas. We were desperate, so we tried it. Unfortunately, the Capstar did not work and our cat passed away shortly after taking it. It absolutely devastated us. We loved our cat so much and can’t believe she’s gone. If you are considering using Capstar, please be aware that there is a risk that it could kill your pet. We would want no one to go through the pain and heartache that we are currently experiencing”.

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

Can Capstar Hurt My Cat?

No, Capstar cannot hurt your cat. This FDA-approved medication is safe and effective for cats and kittens four weeks of age and older weighing at least two pounds. Capstar works by causing the fleas to convulse and then die within minutes.

Although rare, some side effects may include temporary restlessness or lethargy, vomiting, diarrhea, increased appetite or panting. If you notice any of these side effects, contact your veterinarian immediately.

Do Vets Recommend Capstar for Cats?

There are a variety of over-the-counter (OTC) and prescription medications available to treat fleas on cats. One such product is Capstar, an oral tablet that begins killing fleas within 30 minutes of administration. But do vets recommend it for your cat?

Vets definitely recommend Capstar for cats. It’s a fast-acting, non-prescription treatment for fleas, and it’s easy to use. The pill is given orally and begins working within 30 minutes, which means you don’t have to wait around while your cat suffers from flea bites.

Capstar is also safe for kittens over 4 weeks and pregnant or nursing cats, so you can even use it on your whole feline family at once.

One of the best things about Capstar is that it hardly causes any side effects or long-term damage like other flea treatments might if you follow the directions. You can use Capstar as often as needed without worrying about your cat becoming immune to its effects or suffering from any consequences.

What is the Precaution Before Using Capstar for cats?

When used as directed Capstar is considered safe for cats 4 weeks of age or older and weighing 2 pounds or more. As with any medication, there is always potential for side effects though they are rare with this product.

What Are the Side Effects of Capstar?

While generally safe and well-tolerated, there are some potential side effects associated with Capstar use in cats. These include:

• Vomiting: This is the most common side effect reported with CapStar use in cats. If your cat vomits within an hour of taking the tablet, give them another dose immediately as it may have been expelled before it could take effect. If vomiting persists or occurs more than once, stop giving the medication and contact your veterinarian right away as your cat may be allergic or otherwise unable to tolerate nitenpyram.

• Diarrhea: Diarrhea has also been reported with CapStar use but is less common than vomiting . If your cat experiences diarrhea after taking CapStar, contact your veterinarian but continue giving the medication as directed unless instructed otherwise.

• Lethargy: Some cats may become lethargic or seem “out of sorts” after taking CapStar. This side effect is usually mild and temporary, but if it persists or seems severe, contact your veterinarian right away.

• Loss of Appetite: a few cats may lose their appetite after taking CapStar.

How Long Do the Side Effects of Capstar Last in Cats?

The side effects of Capstar last for 12- 24 hours. After that, you can expect your cat to return to normal.

If you’re not sure if your feline is experiencing any side effects from the drug, it’s important to monitor them closely while they are taking it. You should watch for any signs of vomiting, diarrhea, or lack of appetite. You can also look out for excessive thirst or urination.

How Long Does Capstar Stay in a Cats System?

Capstar is an oral tablet that is given to cats to kill fleas. The active ingredient in Capstar, nitenpyram, works by paralyzing the fleas’ nervous system, causing them to die within 30 minutes to 6 hours after administration. After that, these flea tablets are flushed out of your cat’s system within the next 24 hours.

Why is My Cat Freaking Out After Applying Capstar?

Many cats will scratch more when they are infested with fleas. The fleas don’t like the Capstar, and they move faster to get away from it. This causes more itching for your cat, which leads to more scratching.

The good news is that the scratching behavior is temporary and is a reaction to the fleas, not the drug.

Find Out Whether Other Things That Can Kill Your Cat


Capster flea tablet is a product that helps control fleas in cats. This tablet can be given to cats that are at least 2 months old. The tablet works by killing adult fleas and breaking the flea life cycle. This product comes in a pack of six tablets, and each tablet is given to your cat once a month.

If you have any questions about using Capster flea tablets, talk to your veterinarian first.

Share This Article To Help Others: