Lethargy after Nitenpyram (Capstar) in cats

926 reports to the FDA describe lethargy in cats given Nitenpyram. That is 11% of all reports for this medicine, compared with 14% across reports for all cat medicines.

926Reports

24%Marked serious

27%Recovered

11%Died or euthanised

Same dayTypical onset

How soon it started

Same day

374 60%

1–2 days

136 22%

3–7 days

31 4.9%

1–4 weeks

47 7.5%

Over a month

40 6.4%

How the animals did

Recovered

251 27%

Recovered with lasting effects

3 0.3%

Still unwell when reported

170 18%

Died

83 9.0%

Euthanised

21 2.3%

Not known

398 43%

Problems reported at the same time

Loss of appetite

296 32%

Restlessness or agitation

180 19%

163 18%

152 16%

98 11%

96 10%

94 10%

89 9.6%

Age of the animals

Under 1 year

180

1–3 years

249

4–7 years

203

8–11 years

129

12+ years

122

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 lethargy in cats?: 926 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).

Lethargy with similar medicines

Lethargy after Spinosad (Comfortis) 1,080 reports · 9.3% of its reports
Lethargy after Imidacloprid + Moxidectin (Advantage Multi) 1,394 reports · 17% of its reports
Lethargy after Lufenuron 236 reports · 21% of its reports
Lethargy after Flumethrin + Imidacloprid (Seresto) 72 reports · 11% of its reports
Lethargy after Imidacloprid + Pyriproxyfen 73 reports · 11% of its reports
Lethargy after Fipronil 62 reports · 12% of its reports
Lethargy after Fipronil + S-methoprene (Frontline Plus) 51 reports · 14% of its reports
Lethargy after Imidacloprid 33 reports · 13% of its reports

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