Tremors after Fipronil in dogs

The FDA has received 65 reports of tremors in dogs after Fipronil. That is 4.6% of all reports for this medicine, compared with 3.4% across reports for all dog medicines.

65Reports
43%Marked serious
48%Recovered
6.2%Died or euthanised
26 daysTypical onset
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How soon it started

Same day
7 14%
1–2 days
3 6.1%
3–7 days
4 8.2%
1–4 weeks
12 24%
Over a month
23 47%

How the animals did

Recovered
26 40%
Recovered with lasting effects
5 7.7%
Still unwell when reported
20 31%
Euthanised
4 6.2%
Not known
10 15%

Problems reported at the same time

Age of the animals

Under 1 year
9
1–3 years
20
4–7 years
17
8–11 years
8
12+ years
11

About this medicine

Fipronil kills fleas and ticks (spot-on).

Questions owners ask

Can Fipronil cause tremors in dogs?
65 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 26 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).

Tremors with similar medicines

All reported side effects of Fipronil in dogs · Medicines most reported with tremors