Are There Any Side Effects to Using Capstar?



Fleas are complete trouble for any cat or dog and their owner so it’s important to find a viable flea treatment that works instantly. Capstar tablets are among the fastest-acting flea control solutions on the market. It is accessible to treat all dogs and cats that are over one month old and over 2 pounds.

6 tablet box of capstar blue 11.4 mg for dogs and cats

However, there is concern over side effects of using Capstar, as with any drug you give to yourself or your pet. We’re going to take a look at Capstar tablets in greater detail to determine whether it might be the item that you’re searching for. Before the end of this article, you’ll get to know the possible side effects that Capstar tablets have for your dogs and cats.



What Are the Side Effects?

Capstar is known to cause certain side effects when consumed. While other unfavorable responses might be the consequence of improper utilization. Symptoms may vary contingent upon which animal is being dealt with; as cats and dogs have distinctive responses to the treatment.

Capstar Side Effects For Both Cats and Dogs
  • Lethargy
  • Vomiting
  • Itching
  • Decreased Appetite
  • Diarrhea
  • Hyperactivity
  • Incoordination
  • Trembling
  • Seizures
  • Panting
  • Vocalization
  • Salivation
  • Fever
  • Nervousness
Capstar Side Effects For Cats
  • Difficulty Breathing
  • Pupil Dilation
  • Increased Heart Rate
Capstar Side Effects For Dogs
  • Depression
  • Allergic Reactions Including Hives

It is really important to mention that, even though this ‘side effects’ area mentions many frightful aggressive reactions that may be linked to Capstar flea medicine, in actuality, such reactions are exceedingly uncommon. I have never personally observed a reaction from Capstar and have utilized a great deal of it. The main reaction I have ordinarily observed is the disturbance and itching reaction.

We recommend Frontline Plus for an applicator approach if you’re still unsure about Capstar. It kills 100% of existing fleas in the first 12 hours and protects for at least another month. You can also use Seresto Flea & Tick Collars for a collar approach. It kills fleas and ticks within 6 hours and protects your pet for up to 8 months.

Take Precaution

Taking a look at the dose range for Capstar pills should give you an idea of the medication’s safety. An entire 11.4mg tablet will be enough for animals weighing between 1kg to 11.36kg. The 1kg animal is getting a dose that is 11.4 x that of the 11.36kg animal but then it isn’t harmful. It demonstrates that Capstar flea drug has an outgoing safety range.

Be vigilant readers! Pets will frequently hint about a disturbance for up to 7 hours after Capstar treatment is given. This specific and regular type of disturbance is described by such signs; scratching, biting the fur, licking the fur and skin twitching. Vocalization, hyperactivity and panting may likewise be seen. This type of response isn’t commonly a consequence of the medication, yet a reaction to the quick demise of fleas. The fleas become momentarily ‘energized’ and begin to twitch as the Nitenpyram poison sets in; making peculiar, conceivably sensitive sensations against the cat or dog’s skin. A recent report in the Journal of Medical Entomology affirms and depicts these responses. It can increase in “scratching, panting, licking and twitching” symptoms in the first 5 hours after Capstar ingestion; with panting and licking proceeding to 7 hours after the medication was first dosed.

Capstar Pros & Cons


  • Kills fleas within half an hour
  • Works for all cats and dogs over a month old and 2 lbs
  • Works for pregnant or lactating pets.
  • Less expensive than other tablets


  • Effects last only 24 hours
  • Does not work on larvae or eggs
  • Unflavored

How to Store It?

Keep in a sealed bundle at room temperature.

Missed Dose?

If you miss a dose or are uncertain the dose was given, a second pill might be given safely.

Drug Description:

Capstar is used to kill adult flea infestations on your pet. It acts really quick and also works on the adult fleas’ nervous system within 30 minutes; killing them all within 4-6 hours. Capstar is valuable in the case of kenneling, pet shows and traveling. It can likewise be utilized as a preventive medicine to give complete protection against fleas. Capstar doesn’t act on young fleas, eggs, or larvae, as they don’t take a blood meal.

Active Ingredient in Capstar:

Nitenpyram is white and yellow and is the active ingredient in Capstar and is an over the counter drug. In case you’re searching for a fast and abrupt fix to those annoying flea issues then Capstar is the best solution for you and your pet. Capstar has a gentle smell but the smell not at all poisonous. Capstar flea control pills are insoluble in water, implying that they won’t break down to form a homogenous solution. Nitenpyram is chemically stable under normal conditions of storage.

How does it work?

Capstar flea control pills are completely absorbed in the intestinal tract during dosing. Following oral dosing, drug levels will immensely reach in the animal’s blood after around 40 minutes in cats and 80 minutes in dogs.

After your pet takes the Capstar tablet, the Nitenpyram is immersed into the bloodstream very quickly. The minute a flea takes a blood meal from your pet, they ingest enough of the drug to kill them.

Nitenpyram is a neonicotinoid, which means it is similar to pesticide nicotine. It acts on the flea central nervous system by fastening to acetylcholine receptors. Acetylcholine is a vital neurotransmitter, and a barrier of the receptor interferes with the passage of nerve signals and leads to the eradication of the fleas’ central nervous system.

How to utilize Capstar flea control pills?

Capstar flea control pills are given to cats and dogs more than about a month of age when the animal’s weight becomes more than 2 lb. Cats and dogs are dosed with Capstar flea drug at a dosage of 1mg/kg orally. A 25-pound dog is roughly 11.4 kg and gets an 11.4 mg dose of Capstar.

Pet WeightCapstar DosageCapstar Package
25.1-125 pounds (11.4-56.8 kg)57.0 mgCapstar Green
2-25 pounds (0.9-11.36 kg)11.4 mgCapstar Blue
Under 2 poundsN/AN/A


Capstar flea control pills are also available in 24 or 60 tablet packages. It is also given without prescription and can be acquired over the counter


You should buy tablets that are right according to the weight of your dog or cat. Try not to divide big tablets into two to offer it to puppies. All cats and dogs in the family unit ought to be treated within the same time with Capstar flea control. This is because untreated pets can go about as a storage house for the fleas. Treatment should start whether in late winter or early springs towards the beginning of the flea season. Treatment can begin whenever fleas are seen on your pet.

In A Nutshell:

Capstar is an excellent treatment to use to get the fleas off from your pet. It is a great immediate solution with effectiveness as quick as 30 minutes. Capstar table suffers from having effectiveness last only 24 hours and not being effective again larvae and eggs. Ensure that you get the correct tablet for your pet; the dosage is contingent upon your pet’s weight and breed. Try not to give dogs tablets to cats and the other way around.

Overall we feel that Capstar is a safe, successful, non-prescription method for killing fleas on your dogs.

Author Bio:

Abigail Kent is an enthusiastic writer who loves to write on lifestyle, fashion, money-saving, and travel blogs. She’s currently writing for Discount Codez. An online discount coupons and promo code site. She holds a bachelor’s degree in computer science. She loves reading books and making new friends. Say hello to her on Twitter.

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