Loss of appetite after Fentanyl in dogs

299 reports to the FDA describe loss of appetite in dogs given Fentanyl. That is 48% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

299Reports
44%Marked serious
52%Recovered
18%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
122 46%
1–2 days
51 19%
3–7 days
25 9.5%
1–4 weeks
25 9.5%
Over a month
40 15%

How the animals did

Recovered
143 48%
Recovered with lasting effects
11 3.7%
Still unwell when reported
29 9.7%
Died
14 4.7%
Euthanised
41 14%
Not known
61 20%

Problems reported at the same time

108 36%
88 29%
56 19%
48 16%
46 15%

Age of the animals

Under 1 year
9
1–3 years
56
4–7 years
84
8–11 years
90
12+ years
19

About this medicine

Type: medicine.

Questions owners ask

Can Fentanyl cause loss of appetite in dogs?
299 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 1 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).

Loss of appetite with similar medicines

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