Loss of appetite after Nitenpyram (Capstar) in cats

The FDA has received 573 reports of loss of appetite in cats after Nitenpyram. That is 6.6% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported less often than average with this medicine.

573Reports

35%Marked serious

22%Recovered

16%Died or euthanised

1 daysTypical onset

How soon it started

Same day

172 43%

1–2 days

129 32%

3–7 days

37 9.2%

1–4 weeks

40 9.9%

Over a month

26 6.4%

How the animals did

Recovered

124 22%

Recovered with lasting effects

4 0.7%

Still unwell when reported

119 21%

Died

56 9.8%

Euthanised

34 5.9%

Not known

236 41%

Problems reported at the same time

296 52%

147 26%

86 15%

73 13%

71 12%

66 12%

66 12%

65 11%

Age of the animals

Under 1 year

110

1–3 years

131

4–7 years

114

8–11 years

12+ years

104

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 loss of appetite in cats?: 573 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).

Loss of appetite with similar medicines

Loss of appetite after Spinosad (Comfortis) 632 reports · 5.5% of its reports
Loss of appetite after Imidacloprid + Moxidectin (Advantage Multi) 901 reports · 11% of its reports
Loss of appetite after Lufenuron 207 reports · 19% of its reports
Loss of appetite after Flumethrin + Imidacloprid (Seresto) 58 reports · 8.6% of its reports
Loss of appetite after Imidacloprid + Pyriproxyfen 54 reports · 8.2% of its reports
Loss of appetite after Fipronil 37 reports · 7.4% of its reports
Loss of appetite after Fipronil + S-methoprene (Frontline Plus) 29 reports · 7.9% of its reports
Loss of appetite after Imidacloprid 24 reports · 9.5% of its reports

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