Apnoea after Isoflurane in cats

74 reports to the FDA describe apnoea in cats given Isoflurane. That is 3.6% of all reports for this medicine, compared with 0.5% across reports for all cat medicines, so it is reported unusually often with this medicine.

74Reports
49%Marked serious
15%Recovered
57%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
36 92%
1–2 days
2 5.1%
3–7 days
0 0.0%
1–4 weeks
1 2.6%
Over a month
0 0.0%

How the animals did

Recovered
11 15%
Still unwell when reported
8 11%
Died
41 55%
Euthanised
1 1.4%
Not known
13 18%

Problems reported at the same time

Age of the animals

Under 1 year
27
1–3 years
16
4–7 years
10
8–11 years
7
12+ years
6

About this medicine

Type: medicine.

Questions owners ask

Can Isoflurane cause apnoea in cats?
74 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).

Apnoea with similar medicines

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