Nitenpyram (Capstar) side effects in cats
8,744 reports sent to the FDA between 2001 and 2026 involve Nitenpyram in cats. The most reported problems were restlessness or agitation, breathing problems, itching. 11% were marked serious, and where it was recorded, signs eased after stopping the medicine in 47% of cases.
About this medicine
Nitenpyram kills adult fleas quickly; a single-dose tablet.
Products with this ingredient include Capstar. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.
Most reported side effects
Share = percentage of this medicine's reports that mention the problem. One report can list several problems.
Reports that it didn't work
Some reports are about the medicine not working (for example a cat still getting fleas or heartworm), not about a side effect.
How soon problems started
Time from the first dose to the first sign, where both dates were reported (6,321 reports).
How the animals did
Breeds named most often
Popular breeds appear more often because there are more of them.
- Domestic Shorthair 3,449 reports
- Domestic 1,301 reports
- Domestic Longhair 1,031 reports
- Domestic Mediumhair 486 reports
- Maine Coon 213 reports
- Persian 146 reports
- Siamese 116 reports
- Ragdoll 78 reports
- Himalayan 67 reports
- Russian 37 reports