Itching after Nitenpyram (Capstar) in dogs

1,450 reports to the FDA describe itching in dogs given Nitenpyram. That is 13% of all reports for this medicine, compared with 4.3% across reports for all dog medicines, so it is reported unusually often with this medicine.

1,450Reports

9.0%Marked serious

18%Recovered

1.2%Died or euthanised

1 daysTypical onset

How soon it started

Same day

518 49%

1–2 days

189 18%

3–7 days

70 6.6%

1–4 weeks

111 10%

Over a month

175 16%

How the animals did

Recovered

256 18%

Recovered with lasting effects

12 0.8%

Still unwell when reported

332 23%

Died

13 0.9%

Euthanised

5 0.3%

Not known

832 57%

Problems reported at the same time

Didn't stop fleas

517 36%

Restlessness or agitation

236 16%

131 9.0%

122 8.4%

98 6.8%

96 6.6%

90 6.2%

81 5.6%

Age of the animals

Under 1 year

159

1–3 years

386

4–7 years

391

8–11 years

237

12+ years

140

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 itching in dogs?: 1,450 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 1 day 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).

Itching with similar medicines

Itching after Spinosad (Comfortis) 3,874 reports · 6.8% of its reports
Itching after Lufenuron + Milbemycin Oxime (Sentinel) 1,223 reports · 4.7% of its reports
Itching after Imidacloprid + Moxidectin (Advantage Multi) 2,227 reports · 17% of its reports
Itching after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 281 reports · 2.8% of its reports
Itching after Fipronil + S-methoprene (Frontline Plus) 330 reports · 11% of its reports
Itching after Flumethrin + Imidacloprid (Seresto) 610 reports · 27% of its reports
Itching after Imidacloprid 297 reports · 16% of its reports
Itching after Fipronil 138 reports · 9.8% of its reports
Itching after Lufenuron 178 reports · 17% of its reports
Itching after Imidacloprid + Permethrin + Pyriproxyfen 206 reports · 28% of its reports

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