Swelling after Nitenpyram (Capstar) in cats

The FDA has received 44 reports of swelling in cats after Nitenpyram. That is 0.5% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported less often than average with this medicine.

44Reports

23%Marked serious

14%Recovered

27%Died or euthanised

1 daysTypical onset

How soon it started

Same day

9 39%

1–2 days

8 35%

3–7 days

0 0.0%

1–4 weeks

3 13%

Over a month

3 13%

How the animals did

Recovered

6 14%

Still unwell when reported

6 14%

Died

8 18%

Euthanised

4 9.1%

Not known

20 45%

Problems reported at the same time

14 32%

12 27%

10 23%

9 20%

8 18%

7 16%

7 16%

4 9.1%

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 swelling in cats?: 44 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).

Swelling with similar medicines

Swelling after Spinosad (Comfortis) 40 reports · 0.3% of its reports
Swelling after Imidacloprid + Moxidectin (Advantage Multi) 72 reports · 0.9% of its reports
Swelling after Lufenuron 121 reports · 11% of its reports

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