Itching after Fipronil in cats

63 reports to the FDA describe itching in cats given Fipronil. That is 13% of all reports for this medicine, compared with 8.9% across reports for all cat medicines.

63Reports
21%Marked serious
33%Recovered
0.0%Died or euthanised
10 daysTypical onset
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How soon it started

Same day
12 24%
1–2 days
1 2.0%
3–7 days
10 20%
1–4 weeks
14 29%
Over a month
12 24%

How the animals did

Recovered
18 29%
Recovered with lasting effects
3 4.8%
Still unwell when reported
20 32%
Not known
22 35%

Problems reported at the same time

11 17%
Application site reaction
6 9.5%
Dry skin
5 7.9%

Age of the animals

Under 1 year
5
1–3 years
16
4–7 years
11
8–11 years
9
12+ years
13

About this medicine

Fipronil kills fleas and ticks (spot-on).

Questions owners ask

Can Fipronil cause itching 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 10 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).

Itching with similar medicines

All reported side effects of Fipronil in cats · Medicines most reported with itching