Death after Fipronil in dogs

52 reports to the FDA describe death in dogs given Fipronil. That is 3.7% of all reports for this medicine, compared with 5.2% across reports for all dog medicines.

52Reports
98%Marked serious
0.0%Recovered
98%Died or euthanised
144 daysTypical onset
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How soon it started

Same day
6 25%
1–2 days
1 4.2%
3–7 days
1 4.2%
1–4 weeks
2 8.3%
Over a month
14 58%

How the animals did

Died
24 46%
Euthanised
27 52%
Not known
1 1.9%

Problems reported at the same time

Age of the animals

Under 1 year
3
1–3 years
5
4–7 years
10
8–11 years
14
12+ years
18

About this medicine

Fipronil kills fleas and ticks (spot-on).

Questions owners ask

Can Fipronil cause death in dogs?
52 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 144 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).

Death with similar medicines

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