Not drinking after Nitenpyram (Capstar) in dogs

The FDA has received 107 reports of not drinking in dogs after Nitenpyram. That is 1.0% of all reports for this medicine, compared with 0.5% across reports for all dog medicines, so it is reported unusually often with this medicine.

107Reports
33%Marked serious
20%Recovered
11%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
48 52%
1–2 days
25 27%
3–7 days
8 8.6%
1–4 weeks
4 4.3%
Over a month
8 8.6%

How the animals did

Recovered
21 20%
Still unwell when reported
27 25%
Died
8 7.5%
Euthanised
4 3.7%
Not known
47 44%

Problems reported at the same time

Age of the animals

Under 1 year
28
1–3 years
28
4–7 years
24
8–11 years
16
12+ years
10

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 not drinking in dogs?
107 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).

Not drinking with similar medicines

All reported side effects of Nitenpyram in dogs · Medicines most reported with not drinking