Hydromorphone side effects in cats

273 reports sent to the FDA between 2009 and 2026 involve Hydromorphone in cats. The most reported problems were fever, loss of appetite, behaviour change. 46% were marked serious, and where it was recorded, signs eased after stopping the medicine in 50% of cases.

273Reports
46%Marked serious
1.5%Only medicine involved
38%Recovered
15%Died or euthanised
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About this medicine

Type: medicine.

Most reported side effects

54 20%
33 12%
24 8.8%
Hair loss
18 6.6%
Wobbliness (ataxia)
17 6.2%
Dilated pupils
14 5.1%
Hypotension
14 5.1%
Not sleeping
14 5.1%
Vomiting
13 4.8%
Hypothermia
13 4.8%

Share = percentage of this medicine's reports that mention the problem. One report can list several problems.

Reports that it didn't work

Some reports are about the medicine not working (for example a cat still getting fleas or heartworm), not about a side effect.

Didn't work as expected
15 5.5%

How soon problems started

Same day
146 60%
1–2 days
60 24%
3–7 days
14 5.7%
1–4 weeks
18 7.3%
Over a month
7 2.9%

Time from the first dose to the first sign, where both dates were reported (245 reports).

How the animals did

Recovered
104 38%
Recovered with lasting effects
1 0.4%
Still unwell when reported
68 25%
Died
26 9.5%
Euthanised
15 5.5%
Not known
59 22%

Breeds named most often

Popular breeds appear more often because there are more of them.

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