Blood problems after Isoflurane in cats

60 reports to the FDA describe blood problems in cats given Isoflurane. That is 3.0% 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.

60Reports
80%Marked serious
13%Recovered
22%Died or euthanised
5 daysTypical onset
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How soon it started

Same day
12 22%
1–2 days
9 17%
3–7 days
13 24%
1–4 weeks
14 26%
Over a month
6 11%

How the animals did

Recovered
7 12%
Recovered with lasting effects
1 1.7%
Still unwell when reported
31 52%
Died
7 12%
Euthanised
6 10%
Not known
8 13%

Problems reported at the same time

31 52%
15 25%
13 22%
Decreased packed cell volume (pcv)
12 20%

Age of the animals

Under 1 year
13
1–3 years
3
4–7 years
8
8–11 years
17
12+ years
19

About this medicine

Type: medicine.

Questions owners ask

Can Isoflurane cause blood problems in cats?
60 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 5 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).

Blood problems with similar medicines

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