Tremors after Nitenpyram (Capstar) in cats

205 reports to the FDA describe tremors in cats given Nitenpyram. That is 2.3% of all reports for this medicine, compared with 2.6% across reports for all cat medicines.

205Reports

30%Marked serious

35%Recovered

10%Died or euthanised

Same dayTypical onset

How soon it started

Same day

115 73%

1–2 days

27 17%

3–7 days

5 3.2%

1–4 weeks

7 4.5%

Over a month

3 1.9%

How the animals did

Recovered

71 35%

Recovered with lasting effects

1 0.5%

Still unwell when reported

33 16%

Died

17 8.3%

Euthanised

4 2.0%

Not known

79 39%

Problems reported at the same time

Breathing problems

65 32%

Restlessness or agitation

56 27%

50 24%

42 20%

41 20%

34 17%

30 15%

28 14%

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 tremors in cats?: 205 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 the same 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).

Tremors with similar medicines

Tremors after Spinosad (Comfortis) 76 reports · 0.7% of its reports
Tremors after Imidacloprid + Moxidectin (Advantage Multi) 413 reports · 5.1% of its reports

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