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Capstar

Capstar (nitenpyram) Cat Flea Treatment, Fast-Acting Oral Flea Treatment for Cats 2-25 lbs, Vet-Recommended Medication Tablets Start Killing in 30 Minutes, 6 Doses

  • Based on 38,655 reviews
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Availability: In Stock.
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Arrives Wednesday, Oct 7
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Size: 6 Count


Features

  • CAPSTAR for cats (nitenpyram) starts killing adult fleas in just 30 minutes
  • With one dose of CAPSTAR cat flea medication, you can watch the dead fleas fall off your pet
  • If your pet gets reinfested with fleas, simply give another dose of the cat flea pills as often as once a day
  • CAPSTAR nitenpyram for cats is a fast, effective flea treatment that is available over the counter
  • CAPSTAR oral cat flea treatment (11.4 mg) is safe for cats and kittens 4 weeks and older that weigh 2-25 pounds

Description

Capstar (nitenpyram) is a fast-acting flea treatment tablet for use in dogs and cats that starts killing fleas in only 30 minutes. A single dose of Capstar kills 90% of adult fleas within 4 hours for dogs and 6 hours for cats, ridding your pet of these pesky parasites. Capstar is for dogs, puppies, cats, and kittens 2 pounds of body weight or greater and 4 weeks of age or older. Key Features Capstar is for dogs, puppies, cats and kittens 2 pounds of body weight or greater and 4 weeks of age and older. Dosing Capstar is available in 2 dosages: Cats and dogs from 2 to 25 pounds (11.4 mg) Dogs from 25.1 - 125 pounds (57 mg) Administration To give Capstar tablets, place the oral tablet directly in your pet’s mouth or hide it in food. Use with Other Medications If your pet is currently receiving a monthly or longer-lasting flea preventative medication but still becomes infested with fleas, it is safe to administer Capstar to address a flea infestation. Capstar may also be used together with other products, including heartworm preventatives, corticosteroids, antibiotics, vaccines, deworming medications, and shampoos. Re-infestations Capstar kills adult fleas on dogs and cats, offering quick relief for your furry friend. While Capstar works fast to kill adult fleas and alleviate a current infestation, a subsequent preventative solution is recommended to prevent future re-infestations from any existing flea eggs and larvae in the environment. If you notice more fleas have found their way onto your dog or cat in the days following treatment, continue treating your dog or cat with Capstar with up to one dose per day. Important Safety Information Capstar is safe to use in puppies and kittens 4 weeks of age and older, and 2 pounds of body weight or greater. Always read, understand, and follow the label and use directions.

Brand: Capstar


Item Form: Tablets


Scent: unscented


Item Weight: 4.54 g


Active Ingredients: Nitenpyram


Allergen Information: Gluten Free


Dog Breed Size: Small


Unit Count: 6 Count


Color: Pink


Age Range (Description): All Life Stages


Product Dimensions ‏ : ‎ 4.92 x 0.79 x 2.99 inches; 0.16 ounces


Item model number ‏ : ‎ CA4920Y07AMZ2


Date First Available ‏ : ‎ March 20, 2019


Manufacturer ‏ : ‎ Vetio Animal Health


Best Sellers Rank: #337 in Pet Supplies (See Top 100 in Pet Supplies) #1 in Cat Flea Pills


#1 in Cat Flea Pills:


Customer Reviews: 4.4 4.4 out of 5 stars (38,655)


Brand Name: Capstar


Unit Count: 6 Count


Age Range Description: All Life Stages


UPC: 727804366674 073091033394


Included Components: Capstar Flea Tablet for Cats 11.4 mg (2-25 lbs)


Item Type Name: Capstar Fast-Acting Oral Flea Treatment for Cats


Manufacturer: Vetio Animal Health


Model Number: CA4920Y07AMZ2


Manufacturer Part Number: CA4920Y07AMZ2


Warranty Description: No Warranty


Item Form: Tablets


Scent Name: unscented


Dog Breed Size: Small


Target Species: Cat


Item Weight: 4.54 g


Allergen Information: Gluten Free


Active Ingredients: Nitenpyram


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 7

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Instant Relief for Flea Infestations – A Must-Have for Pet Owners!
Review Image by Heaven
Review Image by Heaven
We recently tried the CAPSTAR (nitenpyram) Oral Flea Treatment for our pets, and it has been a game-changer in dealing with flea infestations. As a pet owner with multiple animals, flea treatments are essential, and this product provides fast, effective relief for our furry friends. Fast-Acting and Highly Effective What stands out about CAPSTAR is how quickly it works. After just a single dose, we saw immediate results. Within 30 minutes, fleas were dropping off our pets, and within a couple of hours, the infestation was significantly reduced. It’s perfect for those times when your pets need instant relief, especially if you’re dealing with an active flea problem. Safe and Easy to Administer This treatment is incredibly easy to give to our pets. The pills are small and can be given either directly or mixed with food. Both of our pets had no problem taking it, and it didn’t cause them any distress. The oral formula is safe and gentle, so we didn’t have to worry about harsh side effects. Works Quickly Between Other Treatments While this treatment doesn’t provide long-term flea prevention, it is an excellent quick-fix for an immediate infestation. It works well when paired with a monthly flea preventive to ensure your pets stay flea-free in the long run. It’s perfect for situations when you need fast relief before starting a longer-term flea prevention routine. Great Value for the Price For the results it delivers, the CAPSTAR Flea Treatment is a great value. It’s affordable and effective, especially for pet owners who are dealing with sudden flea issues. One dose is enough to take care of the problem, making it a practical option for those who need quick action. Final Verdict: A Must-Have for Fast Flea Relief If you’re looking for immediate, fast-acting flea relief for your pets, CAPSTAR Oral Flea Treatment is the product to choose. It’s effective, easy to administer, and works quickly to eliminate fleas, providing much-needed comfort for your pets. ✔ Pros: Fast-acting, easy to administer, effective, safe for pets ✘ Cons: Doesn’t provide long-term prevention (but works well with other treatments) Would I buy it again? Yes, especially for quick flea relief! ... show more
Reviewed in the United States on March 14, 2025 by Heaven
    • AMAZINGLY EFFECTIVE almost immediately !
Amazing stuff ! Immediate action, dead fleas start falling out of our cat's dense coat in 30 minutes or less. Seems to take up to maybe 4 hours to completely kill ALL the fleas ! This tablet makes every other fleas remedy a joke. It doesn't stick around for long, or work for long though. It just kills fleas right away, then it's eliminated from the cat's system within hours. VERY VERY EFFECTIVE !!! It seems crazy that it can be used every couple of days, or on mother cats feeding kittens. Evidently it works by interference with an enzyme involved in making fleas shell exoskeleton bodies. Mamals don't have or use that enzyme I guess, so there's no effect on the cat ! But it kills fleas really quickly ! It's gratifying to see them falling out of his fur... Be aware that the fleas might be trying for a last meal or jumping around as they die. Something makes our cat a *litt bit* crazy going after fleas for an hour or so after taking Capstar. Nothing major, but you might notice it. It doesn't last long at all because all the fleas DIE quickly ! No fuss, no muss, just a comfortable cat in 2 hours or less in my experience ! It's PAINFULLY EXPENSIVE, but it works extremely well, and it's a lot less time, mess, and chemicals than an effective flea bath. ... show more
Reviewed in the United States on May 10, 2026 by Zan Diener
    • Perfect
Review Image by Stephanie
I have been rescuing strays left and right and this has been such a life saver! It leaves a little residue look but then once’s its dry that greasiness look is gone! I had a kitten i rescued with fleas coming out of her nose and every area after a dawn bath and this the next day she was flea less!!! Great product for me and my rescues! ... show more
Reviewed in the United States on August 4, 2026 by Stephanie
    • Yes Kills fleas fast. Doesn’t kill larvae and eggs.
Works well to kill fleas fast, but… The Capstar starts working within 30mins, and kills all biting adults within 6hrs and leaves the cats system after 24hrs. It does not target the larvae and eggs, and the cycle will continue. You will need a longer lasting topical along side the capstar to “target” the larvae and eggs. I got frontline plus as my part 2, it doesn’t kill larvae and eggs either, it just stunts their development to maturation they will naturally die off of starvation within 1-2weeks. The cocooned pupae can still be protected and dormant for 6-12 months if undisturbed. It does what it says - but NEEDS part 2 + Steam cleaning and daily vacuuming. ... show more
Reviewed in the United States on May 10, 2026 by Cody Frank
    • Absolutely the best value for the price.
Haven’t seen anything but dead fleas and four dead ticks in the floor. Works great within a very short time and keeps them off the cats. A whole lot cheaper than other brands and works just as well! They are all stretched out sleeping without any jumping up to scratch.
Reviewed in the United States on July 31, 2026 by Beatrice Stagakes
    • Capstar
This thing works! Thats all I gotta say. It kills fleas, but u still have to be proactive in flea prevention at your house. It's not going to thoroughly solve the issue, but it definitely helps with huge flea infestations.
Reviewed in the United States on August 21, 2026 by Amazon Customer
    • URGENT: MONITOR YOUR CAT(S) AFTER GIVING THIS TO THEM!!
I have 5 cats: the 3 oldest are 12, one is 10 and the youngest (Maisie) is 5. They are all indoor cats that I've had since they were kittens, they don't go outside and they're all healthy with no known medical issues. They've been treated with Advantage or Revolution (the liquid on the back of the neck) before but I've never given them flea treatment in a pill form. A good friend of mine recommended Capstar, saying she's given it to her 2 cats for years with no problems and it works great. I dosed all the cats at 10:45 AM on Saturday, April 18 and then just kept an eye on them as I was puttering around doing housework and paying bills. At 2:10 PM, totally out of the blue, Maisie had a Grand Mal seizure! She was sleeping on the cat tree, per usual, and suddenly let out a screech, started flopping around and before I could get to her she fell out of the cat tree to the carpet. There she continued to convulse and shake, froth at the mouth and her pupils were completely dilated. I finally got a blanket around her and then held her in my arms (loosely but enough to make her feel secure) just as her bladder let loose and she peed on me. The seizure lasted about a minute and afterward she was sluggish and confused but otherwise okay. Pupils went back to normal a minute later and then I offered her a treat which she gobbled down. She slept the rest of the afternoon with me keeping a close eye on her. I called the emergency vet and they said since she's acting normal for now to just continue to monitor her but let them know if it happens again. Scared the absolute crap out of me, that's for sure!! I thought omg, omg, I just killed my cat!! I've had cats my entire life and I've never had any of them react to flea meds like this. Long story short, 4 more days went by (I kept an eye on the cats with home cameras while I was at work) and nothing, so I thought the danger was past. Then on Wednesday, April 22 Maisie had another seizure at 7:10 AM, again out of the blue - she'd just had breakfast. The emergency vet said it could take "up to a week" for the meds to leave her system completely. As of today, Sunday April 26, there hasn't been a repeat performance and I'm hoping and praying there never will be again. Maisie seems to be fine with no damage done but only time will tell. I'm not saying anything against Captar - it's been around a long time and plenty of pet owners swear by it (for that matter, my other 4 cats are perfectly fine, no reaction whatsoever) but PLEASE WATCH YOUR PETS CLOSELY AFTER GIVING THEM THIS - OR ANY - MEDICINE!! ... show more
Reviewed in the United States on April 26, 2026 by Lustron Lady
    • Fast acting Capstar, fleas gone in minutes
Love how fast it works, fleas are gone in about 30 minutes. The six doses are easy to use and the box fits my 2-25 lb cat without drama. Safe for cats and kittens 4 weeks and older, which is a win. Great for stopping re-infestations too. Only tiny nitpick is the packaging could be a bit easier to split sometimes. ... show more
Reviewed in the United States on June 24, 2026 by Amazon Customer

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