Swelling after Isoflurane in cats

The FDA has received 106 reports of swelling in cats after Isoflurane. That is 5.2% of all reports for this medicine, compared with 1.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

106Reports
59%Marked serious
24%Recovered
27%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
53 63%
1–2 days
17 20%
3–7 days
9 11%
1–4 weeks
3 3.6%
Over a month
2 2.4%

How the animals did

Recovered
25 24%
Still unwell when reported
29 27%
Died
25 24%
Euthanised
4 3.8%
Not known
23 22%

Problems reported at the same time

Age of the animals

Under 1 year
45
1–3 years
12
4–7 years
10
8–11 years
20
12+ years
13

About this medicine

Type: medicine.

Questions owners ask

Can Isoflurane cause swelling in cats?
106 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).

Swelling with similar medicines

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