Weakness after Nitenpyram (Capstar) in dogs

The FDA has received 75 reports of weakness in dogs after Nitenpyram. That is 0.7% of all reports for this medicine, compared with 1.4% across reports for all dog medicines, so it is reported less often than average with this medicine.

75Reports

36%Marked serious

19%Recovered

19%Died or euthanised

1 daysTypical onset

How soon it started

Same day

16 35%

1–2 days

19 41%

3–7 days

4 8.7%

1–4 weeks

2 4.3%

Over a month

5 11%

How the animals did

Recovered

12 16%

Recovered with lasting effects

2 2.7%

Still unwell when reported

16 21%

Died

11 15%

Euthanised

3 4.0%

Not known

31 41%

Problems reported at the same time

35 47%

29 39%

26 35%

19 25%

18 24%

14 19%

11 15%

9 12%

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 weakness in dogs?: 75 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).

Weakness with similar medicines

Weakness after Spinosad (Comfortis) 332 reports · 0.6% of its reports
Weakness after Lufenuron + Milbemycin Oxime (Sentinel) 192 reports · 0.7% of its reports
Weakness after Imidacloprid + Moxidectin (Advantage Multi) 159 reports · 1.2% of its reports
Weakness after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 55 reports · 0.6% of its reports
Weakness after Fipronil + S-methoprene (Frontline Plus) 39 reports · 1.3% of its reports
Weakness after Flumethrin + Imidacloprid (Seresto) 28 reports · 1.2% of its reports
Weakness after Imidacloprid 21 reports · 1.1% of its reports
Weakness after Fipronil 27 reports · 1.9% of its reports

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