Didn't stop fleas after Nitenpyram (Capstar) in dogs

The FDA has received 6,142 reports of didn't stop fleas in dogs after Nitenpyram. That is 57% of all reports for this medicine, compared with 6.2% across reports for all dog medicines, so it is reported unusually often with this medicine.

6,142Reports

3.5%Marked serious

2.0%Recovered

0.4%Died or euthanised

3 daysTypical onset

How soon it started

Same day

828 21%

1–2 days

1,039 26%

3–7 days

678 17%

1–4 weeks

833 21%

Over a month

603 15%

How the animals did

Recovered

115 1.9%

Recovered with lasting effects

10 0.2%

Still unwell when reported

1,011 16%

Died

20 0.3%

Euthanised

6 0.1%

Not known

4,980 81%

Problems reported at the same time

Didn't work as expected

610 9.9%

517 8.4%

278 4.5%

231 3.8%

107 1.7%

98 1.6%

97 1.6%

95 1.5%

Age of the animals

Under 1 year

474

1–3 years

1,560

4–7 years

1,512

8–11 years

907

12+ years

512

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 stop fleas in dogs?: 6,142 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 stop fleas with similar medicines

Didn't stop fleas after Spinosad (Comfortis) 13,280 reports · 23% of its reports
Didn't stop fleas after Lufenuron + Milbemycin Oxime (Sentinel) 977 reports · 3.8% of its reports
Didn't stop fleas after Imidacloprid + Moxidectin (Advantage Multi) 1,444 reports · 11% of its reports
Didn't stop fleas after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 498 reports · 5.0% of its reports
Didn't stop fleas after Fipronil + S-methoprene (Frontline Plus) 576 reports · 19% of its reports
Didn't stop fleas after Flumethrin + Imidacloprid (Seresto) 882 reports · 39% of its reports
Didn't stop fleas after Imidacloprid 1,054 reports · 55% of its reports
Didn't stop fleas after Fipronil 394 reports · 28% of its reports
Didn't stop fleas after Lufenuron 44 reports · 4.3% of its reports
Didn't stop fleas after Imidacloprid + Permethrin + Pyriproxyfen 219 reports · 30% of its reports

All reported side effects of Nitenpyram in dogs · Medicines most reported with didn't stop fleas