Capaction
Capaction is a brand-name flea treatment medication containing the active ingredient nitenpyram, used to eliminate flea infestations in cats and dogs. It provides rapid relief by killing adult fleas within 30 minutes of administration, making it useful for immediate flea control. This oral medication is typically available by prescription from a veterinarian.
Capaction is a fast-acting oral flea treatment for cats and dogs that kills adult fleas within hours of administration.
Key facts at a glance
- RxNorm
- 2571992
- Generic
- Capaction
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Capaction is used to treat flea infestations in cats and dogs. It is effective against adult fleas and can be used as part of a comprehensive flea control program, including treating flea allergy dermatitis and reducing flea populations in the home.
Capaction contains nitenpyram, a neonicotinoid insecticide that works by binding to nicotinic acetylcholine receptors in insects. This causes rapid depolarization of nerve cells, leading to paralysis and death of adult fleas.
Capaction is for veterinary use only and should be administered according to your veterinarian's instructions. It does not prevent future flea infestations and has no effect on flea eggs or larvae. Side effects are rare but may include itching, hyperactivity, or digestive upset. Consult your veterinarian before use, especially if your pet is pregnant, nursing, or has known health conditions.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy