Weakness after Isoflurane in dogs

The FDA has received 70 reports of weakness in dogs after Isoflurane. That is 2.5% of all reports for this medicine, compared with 1.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

70Reports
83%Marked serious
19%Recovered
40%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
22 34%
1–2 days
10 16%
3–7 days
12 19%
1–4 weeks
12 19%
Over a month
8 13%

How the animals did

Recovered
13 19%
Still unwell when reported
21 30%
Died
14 20%
Euthanised
14 20%
Not known
8 11%

Problems reported at the same time

Age of the animals

Under 1 year
6
1–3 years
18
4–7 years
19
8–11 years
23
12+ years
4

About this medicine

Type: medicine.

Questions owners ask

Can Isoflurane cause weakness in dogs?
70 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 3 days 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).

Weakness with similar medicines

All reported side effects of Isoflurane in dogs · Medicines most reported with weakness