Foaming at the mouth after Nitenpyram (Capstar) in cats

The FDA has received 63 reports of foaming at the mouth in cats after Nitenpyram. That is 0.7% of all reports for this medicine, compared with 1.3% across reports for all cat medicines, so it is reported less often than average with this medicine.

63Reports
25%Marked serious
40%Recovered
14%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
44 75%
1–2 days
13 22%
3–7 days
1 1.7%
1–4 weeks
0 0.0%
Over a month
1 1.7%

How the animals did

Recovered
25 40%
Still unwell when reported
5 7.9%
Died
7 11%
Euthanised
2 3.2%
Not known
24 38%

Problems reported at the same time

Restlessness or agitation
16 25%
Vomiting
12 19%
Breathing problems
12 19%
Death
9 14%
Drooling
9 14%
Vocalising
8 13%
Behaviour change
8 13%
Lethargy
7 11%

Age of the animals

Under 1 year
19
1–3 years
19
4–7 years
12
8–11 years
5
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 foaming at the mouth in cats?
63 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).

Foaming at the mouth with similar medicines

All reported side effects of Nitenpyram in cats · Medicines most reported with foaming at the mouth