Breathing problems after Fipronil in dogs

64 reports to the FDA describe breathing problems in dogs given Fipronil. That is 4.5% of all reports for this medicine, compared with 2.7% across reports for all dog medicines, so it is reported unusually often with this medicine.

64Reports
55%Marked serious
41%Recovered
25%Died or euthanised
35 daysTypical onset
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How soon it started

Same day
7 20%
1–2 days
3 8.6%
3–7 days
2 5.7%
1–4 weeks
5 14%
Over a month
18 51%

How the animals did

Recovered
25 39%
Recovered with lasting effects
1 1.6%
Still unwell when reported
8 13%
Died
7 11%
Euthanised
9 14%
Not known
14 22%

Problems reported at the same time

Age of the animals

Under 1 year
2
1–3 years
13
4–7 years
18
8–11 years
19
12+ years
11

About this medicine

Fipronil kills fleas and ticks (spot-on).

Questions owners ask

Can Fipronil cause breathing problems in dogs?
64 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 35 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).

Breathing problems with similar medicines

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