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CAPSTAR Blue for Dogs 2-25 lbs (6 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

5 Reviews
80% (4)
20% (1)
0% (0)
0% (0)
0% (0)
60% Recommend this product (3 of 5 responses)
By Gail
Frostburg, MD
Capstar convenience
September 26, 2016
Capstar is very convenient and works well. I use it because it is easier for me than trying to get my cat to accept the liquid flea solution which is applied to her neck.
ProsEasy to administer.
ConsNot long lasting, thus more costly.
By Dee
Great relief
November 28, 2015
I have a feral cat that doesn't allow me to handle her. I can tell when she's itchy, so Capstar is very helpful for a little relief. It's easy to break it up in her food and, although it is only short term, I know she feels good for a little bit.
Proseasy to use, inexpensive
Consshort term, maybe not the healthiest choice since it has to be ingested
By Dorothy H.
Clover, South Carolina
Quick to give and fast to act
July 10, 2015
Quick and fairly easy to give to my cats. Mainly needed during the summer months
Prosworks as advertised
Consbitter taste
By Don
It works
June 3, 2011
I don\'t know why some one hasn\'t rated this product before. It works exactly as stated. Fleas start jumping off within minutes. Then follow up with program or like product
May 19, 2011
Capstar was the ONLY way to immediately knock down the massive flea problem we had and give relieft to our pets. Very scary tho as the fleas are dying they dig in and the pets were like in agony for about 20 minutes! Washed them off and it was done.

Customer Q&A

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