Hair loss after Nitenpyram (Capstar) in cats

111 reports to the FDA describe hair loss in cats given Nitenpyram. That is 1.3% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported less often than average with this medicine.

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How soon it started

How the animals did

Problems reported at the same time

Age of the animals

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.

Questions owners ask

Can Nitenpyram cause hair loss in cats?

111 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.

How soon after a dose was it reported?

In half of the reports with dates, it started within 3 days of the first dose.

What should I do?

Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Hair loss with similar medicines

• Hair loss after Spinosad (Comfortis) 76 reports · 0.7% of its reports
• Hair loss after Imidacloprid + Moxidectin (Advantage Multi) 1,437 reports · 18% of its reports
• Hair loss after Lufenuron 83 reports · 7.5% of its reports
• Hair loss after Flumethrin + Imidacloprid (Seresto) 166 reports · 25% of its reports
• Hair loss after Imidacloprid + Pyriproxyfen 83 reports · 13% of its reports
• Hair loss after Fipronil 34 reports · 6.8% of its reports
• Hair loss after Fipronil + S-methoprene (Frontline Plus) 39 reports · 11% of its reports
• Hair loss after Imidacloprid 24 reports · 9.5% of its reports

All reported side effects of Nitenpyram in cats · Medicines most reported with hair loss