Underdose after Nitenpyram (Capstar) in dogs

139 reports to the FDA describe underdose in dogs given Nitenpyram. That is 1.3% of all reports for this medicine, compared with 1.0% across reports for all dog medicines.

139Reports

5.8%Marked serious

7.2%Recovered

1.4%Died or euthanised

1 daysTypical onset

How soon it started

Same day

34 39%

1–2 days

14 16%

3–7 days

20 23%

1–4 weeks

9 10%

Over a month

10 11%

How the animals did

Recovered

10 7.2%

Still unwell when reported

28 20%

Died

2 1.4%

Not known

99 71%

Problems reported at the same time

Didn't stop fleas

95 68%

Itching

17 12%

Lethargy

12 8.6%

Drug administration error

9 6.5%

Didn't work as expected

8 5.8%

Loss of appetite

8 5.8%

Restlessness or agitation

6 4.3%

Vomiting

6 4.3%

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 underdose in dogs?: 139 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).

Underdose with similar medicines

Underdose after Spinosad (Comfortis) 365 reports · 0.6% of its reports
Underdose after Lufenuron + Milbemycin Oxime (Sentinel) 332 reports · 1.3% of its reports
Underdose after Imidacloprid + Moxidectin (Advantage Multi) 144 reports · 1.1% of its reports
Underdose after Lufenuron + Milbemycin Oxime + Praziquantel (Sentinel Spectrum) 132 reports · 1.3% of its reports
Underdose after Fipronil + S-methoprene (Frontline Plus) 31 reports · 1.0% of its reports
Underdose after Imidacloprid 48 reports · 2.5% of its reports

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