Hiding after Nitenpyram (Capstar) in cats

The FDA has received 246 reports of hiding in cats after Nitenpyram. That is 2.8% of all reports for this medicine, compared with 2.4% across reports for all cat medicines.

246Reports
13%Marked serious
40%Recovered
4.9%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
149 76%
1–2 days
22 11%
3–7 days
8 4.1%
1–4 weeks
8 4.1%
Over a month
10 5.1%

How the animals did

Recovered
99 40%
Still unwell when reported
36 15%
Died
8 3.3%
Euthanised
4 1.6%
Not known
99 40%

Problems reported at the same time

Age of the animals

Under 1 year
16
1–3 years
77
4–7 years
80
8–11 years
33
12+ years
25

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 hiding in cats?
246 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).

Hiding with similar medicines

All reported side effects of Nitenpyram in cats · Medicines most reported with hiding