Hyperphosphataemia after Nitenpyram (Capstar) in dogs

The FDA has received 21 reports of hyperphosphataemia in dogs after Nitenpyram. That is 0.2% of all reports for this medicine, compared with 0.6% across reports for all dog medicines, so it is reported less often than average with this medicine.

21Reports
62%Marked serious
9.5%Recovered
43%Died or euthanised
2 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
5 50%
1–2 days
1 10%
3–7 days
2 20%
1–4 weeks
0 0.0%
Over a month
2 20%

How the animals did

Recovered with lasting effects
2 9.5%
Still unwell when reported
3 14%
Died
4 19%
Euthanised
5 24%
Not known
7 33%

Problems reported at the same time

Liver problems
11 52%
Kidney problems
11 52%
Vomiting
10 48%
Loss of appetite
10 48%
Death
9 43%
Lethargy
8 38%
Tremors
6 29%
Blood problems
6 29%

Age of the animals

Under 1 year
6
1–3 years
4
4–7 years
3
8–11 years
2
12+ years
6

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 hyperphosphataemia in dogs?
21 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 2 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).

Hyperphosphataemia with similar medicines

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