Hair loss after Nitenpyram (Capstar) in dogs

195 reports to the FDA describe hair loss in dogs given Nitenpyram. That is 1.8% of all reports for this medicine, compared with 1.0% across reports for all dog medicines, so it is reported unusually often with this medicine.

195Reports

13%Marked serious

5.6%Recovered

0.5%Died or euthanised

3 daysTypical onset

How soon it started

Same day

30 23%

1–2 days

36 27%

3–7 days

26 20%

1–4 weeks

20 15%

Over a month

21 16%

How the animals did

Recovered

8 4.1%

Recovered with lasting effects

3 1.5%

Still unwell when reported

62 32%

Died

1 0.5%

Not known

121 62%

Problems reported at the same time

Didn't stop fleas

107 55%

Itching

98 50%

Skin rash or irritation

26 13%

Vomiting

13 6.7%

Reddening of the skin

13 6.7%

Skin sore

12 6.2%

Allergic reaction

12 6.2%

Loss of appetite

10 5.1%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

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 dogs?: 195 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) 503 reports · 0.9% of its reports
Hair loss after Lufenuron + Milbemycin Oxime (Sentinel) 227 reports · 0.9% of its reports
Hair loss after Imidacloprid + Moxidectin (Advantage Multi) 452 reports · 3.4% of its reports
Hair loss after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 46 reports · 0.5% of its reports
Hair loss after Fipronil + S-methoprene (Frontline Plus) 113 reports · 3.8% of its reports
Hair loss after Flumethrin + Imidacloprid (Seresto) 135 reports · 5.9% of its reports
Hair loss after Imidacloprid 43 reports · 2.3% of its reports
Hair loss after Fipronil 22 reports · 1.6% of its reports
Hair loss after Lufenuron 45 reports · 4.4% of its reports
Hair loss after Imidacloprid + Permethrin + Pyriproxyfen 33 reports · 4.5% of its reports

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