Fever after Hydromorphone in cats

The FDA has received 54 reports of fever in cats after Hydromorphone. That is 20% of all reports for this medicine, compared with 3.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

54Reports
41%Marked serious
54%Recovered
5.6%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
38 78%
1–2 days
7 14%
3–7 days
2 4.1%
1–4 weeks
0 0.0%
Over a month
2 4.1%

How the animals did

Recovered
29 54%
Still unwell when reported
14 26%
Died
1 1.9%
Euthanised
2 3.7%
Not known
8 15%

Problems reported at the same time

Liver problems
5 9.3%
Swelling
4 7.4%
4 7.4%

Age of the animals

Under 1 year
15
1–3 years
10
4–7 years
13
8–11 years
6
12+ years
2

About this medicine

Type: medicine.

Questions owners ask

Can Hydromorphone cause fever in cats?
54 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).

Fever with similar medicines

All reported side effects of Hydromorphone in cats · Medicines most reported with fever