Loss of appetite after Fipronil in dogs

123 reports to the FDA describe loss of appetite in dogs given Fipronil. That is 8.7% of all reports for this medicine, compared with 8.4% across reports for all dog medicines.

123Reports
50%Marked serious
42%Recovered
14%Died or euthanised
22 daysTypical onset
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How soon it started

Same day
11 14%
1–2 days
5 6.3%
3–7 days
6 7.6%
1–4 weeks
23 29%
Over a month
34 43%

How the animals did

Recovered
39 32%
Recovered with lasting effects
13 11%
Still unwell when reported
29 24%
Died
5 4.1%
Euthanised
12 9.8%
Not known
25 20%

Problems reported at the same time

Age of the animals

Under 1 year
9
1–3 years
28
4–7 years
34
8–11 years
31
12+ years
20

About this medicine

Fipronil kills fleas and ticks (spot-on).

Questions owners ask

Can Fipronil cause loss of appetite in dogs?
123 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 22 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).

Loss of appetite with similar medicines

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