Didn't work as expected after Nitenpyram (Capstar) in cats

232 reports to the FDA describe didn't work as expected in cats given Nitenpyram. That is 2.7% of all reports for this medicine, compared with 8.7% across reports for all cat medicines, so it is reported less often than average with this medicine.

232Reports

4.7%Marked serious

4.3%Recovered

1.3%Died or euthanised

3 daysTypical onset

How soon it started

Same day

41 22%

1–2 days

42 23%

3–7 days

40 22%

1–4 weeks

45 24%

Over a month

17 9.2%

How the animals did

Recovered

10 4.3%

Still unwell when reported

108 47%

Died

1 0.4%

Euthanised

2 0.9%

Not known

111 48%

Problems reported at the same time

169 73%

12 5.2%

8 3.4%

7 3.0%

Restlessness or agitation

6 2.6%

Drug dose administration interval too short

6 2.6%

Overdose

5 2.2%

Incorrect dose administered

5 2.2%

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 didn't work as expected in cats?: 232 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 3 days 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).

Didn't work as expected with similar medicines

Didn't work as expected after Spinosad (Comfortis) 1,060 reports · 9.2% of its reports
Didn't work as expected after Imidacloprid + Moxidectin (Advantage Multi) 63 reports · 0.8% of its reports
Didn't work as expected after Imidacloprid + Pyriproxyfen 24 reports · 3.7% of its reports
Didn't work as expected after Fipronil 38 reports · 7.6% of its reports
Didn't work as expected after Fipronil + S-methoprene (Frontline Plus) 22 reports · 6.0% of its reports

All reported side effects of Nitenpyram in cats · Medicines most reported with didn't work as expected