Fever after Isoflurane in cats

The FDA has received 261 reports of fever in cats after Isoflurane. That is 13% 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.

261Reports
45%Marked serious
41%Recovered
7.3%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
163 70%
1–2 days
36 15%
3–7 days
15 6.4%
1–4 weeks
13 5.6%
Over a month
7 3.0%

How the animals did

Recovered
105 40%
Recovered with lasting effects
1 0.4%
Still unwell when reported
98 38%
Died
15 5.7%
Euthanised
4 1.5%
Not known
38 15%

Problems reported at the same time

Age of the animals

Under 1 year
86
1–3 years
56
4–7 years
42
8–11 years
44
12+ years
9

About this medicine

Type: medicine.

Questions owners ask

Can Isoflurane cause fever in cats?
261 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 Isoflurane in cats · Medicines most reported with fever