Decreased activity after Nitenpyram (Capstar) in dogs

The FDA has received 47 reports of decreased activity in dogs after Nitenpyram. That is 0.4% of all reports for this medicine, compared with 0.2% across reports for all dog medicines, so it is reported unusually often with this medicine.

47Reports

26%Marked serious

11%Recovered

11%Died or euthanised

1 daysTypical onset

How soon it started

Same day

17 44%

1–2 days

10 26%

3–7 days

4 10%

1–4 weeks

2 5.1%

Over a month

6 15%

How the animals did

Recovered

5 11%

Still unwell when reported

13 28%

Died

4 8.5%

Euthanised

1 2.1%

Not known

24 51%

Problems reported at the same time

21 45%

9 19%

7 15%

6 13%

6 13%

5 11%

5 11%

5 11%

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 decreased activity in dogs?: 47 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).

Decreased activity with similar medicines

Decreased activity after Spinosad (Comfortis) 111 reports · 0.2% of its reports
Decreased activity after Lufenuron + Milbemycin Oxime (Sentinel) 26 reports · 0.1% of its reports

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