Reddening of the skin after Nitenpyram (Capstar) in dogs

The FDA has received 90 reports of reddening of the skin in dogs after Nitenpyram. That is 0.8% of all reports for this medicine, compared with 0.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

90Reports
19%Marked serious
20%Recovered
0.0%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
33 45%
1–2 days
20 27%
3–7 days
7 9.5%
1–4 weeks
8 11%
Over a month
6 8.1%

How the animals did

Recovered
18 20%
Still unwell when reported
25 28%
Not known
47 52%

Problems reported at the same time

Itching
47 52%
Skin irritation
23 26%
Didn't stop fleas
21 23%
Allergic reaction
19 21%
Lethargy
18 20%
Loss of appetite
15 17%
Breathing problems
13 14%
Hair loss
13 14%

Age of the animals

Under 1 year
7
1–3 years
23
4–7 years
36
8–11 years
14
12+ years
3

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 reddening of the skin in dogs?
90 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).

Reddening of the skin with similar medicines

All reported side effects of Nitenpyram in dogs · Medicines most reported with reddening of the skin