Seizures after Nitenpyram (Capstar) in cats

187 reports to the FDA describe seizures in cats given Nitenpyram. That is 2.1% of all reports for this medicine, compared with 2.6% across reports for all cat medicines.

187Reports

64%Marked serious

22%Recovered

41%Died or euthanised

1 daysTypical onset

How soon it started

Same day

61 48%

1–2 days

27 21%

3–7 days

11 8.7%

1–4 weeks

13 10%

Over a month

14 11%

How the animals did

Recovered

39 21%

Recovered with lasting effects

2 1.1%

Still unwell when reported

20 11%

Died

58 31%

Euthanised

19 10%

Not known

49 26%

Problems reported at the same time

73 39%

33 18%

28 15%

22 12%

22 12%

22 12%

21 11%

18 9.6%

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 seizures in cats?: 187 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).

Seizures with similar medicines

Seizures after Spinosad (Comfortis) 101 reports · 0.9% of its reports
Seizures after Imidacloprid + Moxidectin (Advantage Multi) 156 reports · 1.9% of its reports

All reported side effects of Nitenpyram in cats · Medicines most reported with seizures