Hypothermia after Fentanyl in dogs

81 reports to the FDA describe hypothermia in dogs given Fentanyl. That is 13% of all reports for this medicine, compared with 0.2% across reports for all dog medicines, so it is reported unusually often with this medicine.

81Reports
47%Marked serious
67%Recovered
11%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
45 69%
1–2 days
13 20%
3–7 days
3 4.6%
1–4 weeks
1 1.5%
Over a month
3 4.6%

How the animals did

Recovered
49 60%
Recovered with lasting effects
5 6.2%
Still unwell when reported
6 7.4%
Died
6 7.4%
Euthanised
3 3.7%
Not known
12 15%

Problems reported at the same time

Age of the animals

Under 1 year
3
1–3 years
29
4–7 years
23
8–11 years
18
12+ years
0

About this medicine

Type: medicine.

Questions owners ask

Can Fentanyl cause hypothermia in dogs?
81 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 the same day 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).

Hypothermia with similar medicines

All reported side effects of Fentanyl in dogs · Medicines most reported with hypothermia