Death after Fipronil in cats

The FDA has received 22 reports of death in cats after Fipronil. That is 4.4% of all reports for this medicine, compared with 8.9% across reports for all cat medicines, so it is reported less often than average with this medicine.

22Reports
100%Marked serious
0.0%Recovered
100%Died or euthanised
14 daysTypical onset
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How soon it started

Same day
1 4.8%
1–2 days
5 24%
3–7 days
3 14%
1–4 weeks
6 29%
Over a month
6 29%

How the animals did

Died
14 64%
Euthanised
8 36%

Problems reported at the same time

Kidney problems
3 14%
Dehydration
3 14%
Eye or vision problems
3 14%
Wobbliness (ataxia)
3 14%
Heart murmur
3 14%

Age of the animals

Under 1 year
1
1–3 years
5
4–7 years
3
8–11 years
2
12+ years
10

About this medicine

Fipronil kills fleas and ticks (spot-on).

Questions owners ask

Can Fipronil cause death in cats?
22 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 14 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 cats · Medicines most reported with death