Behaviour change after Isoflurane in cats

250 reports to the FDA describe behaviour change in cats given Isoflurane. That is 12% of all reports for this medicine, compared with 5.4% across reports for all cat medicines, so it is reported unusually often with this medicine.

250Reports
35%Marked serious
33%Recovered
6.0%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
149 61%
1–2 days
62 26%
3–7 days
14 5.8%
1–4 weeks
5 2.1%
Over a month
13 5.3%

How the animals did

Recovered
82 33%
Recovered with lasting effects
1 0.4%
Still unwell when reported
105 42%
Died
8 3.2%
Euthanised
7 2.8%
Not known
47 19%

Problems reported at the same time

Age of the animals

Under 1 year
78
1–3 years
35
4–7 years
46
8–11 years
44
12+ years
38

About this medicine

Type: medicine.

Questions owners ask

Can Isoflurane cause behaviour change in cats?
250 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).

Behaviour change with similar medicines

All reported side effects of Isoflurane in cats · Medicines most reported with behaviour change