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4 PACK CAPSTAR Blue for Dogs 2-25 lbs (24 tablets)

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CAPSTAR Blue a single fast acting dose of Capstar (nitenpyram) should kill the adult fleas on your pet. If your pet gets re-infested with fleas, you can safely give another dose as often as once per day. To administer CAPSTAR tablets, place the pill directly in your pet's mouth, or hide it in food. If you choose to hide the tablet in food, watch closely to make sure your pet swallows the pill. If you are not sure that your pet swallowed the pill, it is safe to administer a second pill.

We recommend you follow up CAPSTAR treatment with a monthly flea control product such as PROGRAM, Frontline or Advantage. Then keep CAPSTAR on hand for the times when there is a visible flea re-infestation.


  • Dogs (4 weeks of age and older and 2 pounds of body weight or greater)


  • Starts killing fleas within 30 minutes
  • Unflavored tablet
  • Safe for pregnant or nursing dogs and cats


Active Ingredient(s): Nitenpyram

Useful Information

A single dose of Capstar should kill the adult fleas on your pet. If your pet gets re-infested with fleas, you can safely give another dose as often as once per day please refer to the package insert for complete information.


  • Capstar is safe use in dogs and puppies 2 pounds of body weight or greater and 4 weeks of age and older. Weigh your pet prior to administration to ensure proper dosage. It is also safe for use in pregnant or breeding dogs.
  • Begins working within 30 minutes. In studies, Capstar achieved greater than 90% effectiveness against adult fleas on dogs within 4 hours.
  • Capstar can be used with lufenuron to provide a Flea Management system. The two products, when used together, kill adult fleas and prevent flea eggs from hatching.
  • Capstar kills adult fleas that cause flea allergy dermatitis (FAD).
  • If you have question about flea control or medical problems associated with flea infestations, please consult your veterinarian.

Side effects: Side effects that may occur in dogs include Lethargy/depression, vomiting, itching, decreased appetite, diarrhea, hyperactivity, in coordination, trembling, seizures, panting, allergic reactions including hives, vocalization, salivation, fever, and nervousness. Side effects that may occur in cats include Hyperactivity, panting, lethargy, itching, vocalization, vomiting, fever, decreased appetite, nervousness, diarrhea, difficulty breathing, salivation, in coordination, seizures, pupil dilation, increased heart rate, and trembling. There are no known drug or food interactions .

Cautions: Pets may scratch as a result of the fleas dying, but it is a temporary condition and not a reaction to the medication itself.

Store this product at room temperature. Keep out of the reach of children and pets.

Customer Reviews

2 Reviews
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50% Recommend this product (1 of 2 responses)
By Diane
Escondido, CA
May 31, 2016
This was a miracle after I discovered an infestation with my 3 cats. Yes, they do scratch - excessively!!! after about 20 mins of administering Capstar - that's because the fleas are reacting to the Capstar in the cats system and then they bite. It's when they bite that they finally start dying, FAST! On cats, it kills all adult, living fleas that are on the animal and will be effective for up to 24 hours. My cats finally SLEPT last night because they weren't crawling. Capstar does nothing for eggs, larvae - only works on live fleas so it's not a miracle like Revolution - it's a quick fix to make your pet comfortable within minutes. YES, I will have a stock of this on hand for when it happens again. No questions about it. I intend to now maintain with Revolution - Frontline Plus is crap.
ProsFAST action, relatively affordable and does exactly what it says it's supposed to.
ConsWish it came in liquid drops, my cats HATE pills - had to crush it up.
By Faye
baytown, tx
These just do not work!
April 4, 2016
I gave them to my 5 housedogs which only weigh about 3,4,5 and 6 pounds. Those are Yorkies. And I gave one to my wiener dog. These tablets didn't even make one bit of difference. They were still crawling with fleas. Their constant scratching makes me feel so badly for them! So I gave them all another pill one week later. Still crawling with fleas. I knew it was too good to be true that I could take care of the fleas so cheaply. I'm going to save my money and get some Frontline. I also bathe them every weekend in a dishpan of salt water with lemon juice and olive oil. The saltwater kills the fleas.

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