Abnormal radiograph finding after Nitenpyram (Capstar) in dogs

The FDA has received 41 reports of abnormal radiograph finding in dogs after Nitenpyram. That is 0.4% of all reports for this medicine, compared with 0.9% across reports for all dog medicines, so it is reported less often than average with this medicine.

41Reports

71%Marked serious

9.8%Recovered

29%Died or euthanised

4 daysTypical onset

How soon it started

Same day

4 17%

1–2 days

6 26%

3–7 days

2 8.7%

1–4 weeks

5 22%

Over a month

6 26%

How the animals did

Recovered

2 4.9%

Recovered with lasting effects

2 4.9%

Still unwell when reported

9 22%

Died

10 24%

Euthanised

2 4.9%

Not known

16 39%

Problems reported at the same time

21 51%

21 51%

21 51%

14 34%

12 29%

Abnormal ultrasound finding

9 22%

Kidney problems

8 20%

Abdominal pain

8 20%

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 abnormal radiograph finding in dogs?: 41 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 4 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).

Abnormal radiograph finding with similar medicines

Abnormal radiograph finding after Spinosad (Comfortis) 215 reports · 0.4% of its reports
Abnormal radiograph finding after Lufenuron + Milbemycin Oxime (Sentinel) 179 reports · 0.7% of its reports
Abnormal radiograph finding after Imidacloprid + Moxidectin (Advantage Multi) 89 reports · 0.7% of its reports
Abnormal radiograph finding after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 40 reports · 0.4% of its reports
Abnormal radiograph finding after Fipronil 24 reports · 1.7% of its reports

All reported side effects of Nitenpyram in dogs · Medicines most reported with abnormal radiograph finding