Seizures after Nitenpyram (Capstar) in dogs

The FDA has received 331 reports of seizures in dogs after Nitenpyram. That is 3.1% of all reports for this medicine, compared with 4.4% across reports for all dog medicines.

331Reports

56%Marked serious

30%Recovered

21%Died or euthanised

1 daysTypical onset

How soon it started

Same day

98 43%

1–2 days

57 25%

3–7 days

17 7.5%

1–4 weeks

25 11%

Over a month

29 13%

How the animals did

Recovered

95 29%

Recovered with lasting effects

5 1.5%

Still unwell when reported

45 14%

Died

48 15%

Euthanised

20 6.0%

Not known

118 36%

Problems reported at the same time

69 21%

59 18%

51 15%

42 13%

32 9.7%

30 9.1%

26 7.9%

26 7.9%

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 dogs?: 331 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) 2,116 reports · 3.7% of its reports
Seizures after Lufenuron + Milbemycin Oxime (Sentinel) 937 reports · 3.6% of its reports
Seizures after Imidacloprid + Moxidectin (Advantage Multi) 520 reports · 4.0% of its reports
Seizures after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 279 reports · 2.8% of its reports
Seizures after Fipronil + S-methoprene (Frontline Plus) 214 reports · 7.2% of its reports
Seizures after Flumethrin + Imidacloprid (Seresto) 123 reports · 5.4% of its reports
Seizures after Imidacloprid 43 reports · 2.3% of its reports
Seizures after Fipronil 72 reports · 5.1% of its reports
Seizures after Lufenuron 65 reports · 6.4% of its reports
Seizures after Imidacloprid + Permethrin + Pyriproxyfen 34 reports · 4.6% of its reports

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