Allergic reaction after Nitenpyram (Capstar) in dogs

189 reports to the FDA describe allergic reaction in dogs given Nitenpyram. That is 1.8% of all reports for this medicine, compared with 2.3% across reports for all dog medicines.

189Reports

32%Marked serious

25%Recovered

3.7%Died or euthanised

Same dayTypical onset

How soon it started

Same day

64 57%

1–2 days

23 21%

3–7 days

4 3.6%

1–4 weeks

12 11%

Over a month

9 8.0%

How the animals did

Recovered

46 24%

Recovered with lasting effects

1 0.5%

Still unwell when reported

40 21%

Died

4 2.1%

Euthanised

3 1.6%

Not known

95 50%

Problems reported at the same time

56 30%

54 29%

42 22%

35 19%

20 11%

Reddening of the skin

19 10%

Breathing problems

17 9.0%

Didn't stop fleas

17 9.0%

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 allergic reaction in dogs?: 189 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).

Allergic reaction with similar medicines

Allergic reaction after Spinosad (Comfortis) 534 reports · 0.9% of its reports
Allergic reaction after Lufenuron + Milbemycin Oxime (Sentinel) 337 reports · 1.3% of its reports
Allergic reaction after Imidacloprid + Moxidectin (Advantage Multi) 267 reports · 2.0% of its reports
Allergic reaction after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 108 reports · 1.1% of its reports
Allergic reaction after Fipronil + S-methoprene (Frontline Plus) 45 reports · 1.5% of its reports
Allergic reaction after Flumethrin + Imidacloprid (Seresto) 31 reports · 1.4% of its reports
Allergic reaction after Imidacloprid 28 reports · 1.5% of its reports
Allergic reaction after Fipronil 22 reports · 1.6% of its reports
Allergic reaction after Lufenuron 73 reports · 7.2% of its reports

All reported side effects of Nitenpyram in dogs · Medicines most reported with allergic reaction