Diarrhea after Nitenpyram (Capstar) in dogs

626 reports to the FDA describe diarrhea in dogs given Nitenpyram. That is 5.8% of all reports for this medicine, compared with 8.4% across reports for all dog medicines.

626Reports

24%Marked serious

23%Recovered

7.0%Died or euthanised

1 daysTypical onset

How soon it started

Same day

159 39%

1–2 days

163 40%

3–7 days

34 8.3%

1–4 weeks

31 7.6%

Over a month

23 5.6%

How the animals did

Recovered

140 22%

Recovered with lasting effects

2 0.3%

Still unwell when reported

104 17%

Died

38 6.1%

Euthanised

6 1.0%

Not known

336 54%

Problems reported at the same time

331 53%

197 31%

180 29%

45 7.2%

39 6.2%

36 5.8%

32 5.1%

32 5.1%

Age of the animals

Under 1 year

153

1–3 years

166

4–7 years

128

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 diarrhea in dogs?: 626 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).

Diarrhea with similar medicines

Diarrhea after Spinosad (Comfortis) 2,388 reports · 4.2% of its reports
Diarrhea after Lufenuron + Milbemycin Oxime (Sentinel) 2,524 reports · 9.7% of its reports
Diarrhea after Imidacloprid + Moxidectin (Advantage Multi) 1,203 reports · 9.2% of its reports
Diarrhea after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 800 reports · 8.0% of its reports
Diarrhea after Fipronil + S-methoprene (Frontline Plus) 230 reports · 7.8% of its reports
Diarrhea after Flumethrin + Imidacloprid (Seresto) 130 reports · 5.7% of its reports
Diarrhea after Imidacloprid 93 reports · 4.9% of its reports
Diarrhea after Fipronil 123 reports · 8.7% of its reports
Diarrhea after Lufenuron 182 reports · 18% of its reports
Diarrhea after Imidacloprid + Permethrin + Pyriproxyfen 53 reports · 7.2% of its reports

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