Lethargy after Isoflurane in cats

248 reports to the FDA describe lethargy in cats given Isoflurane. That is 12% of all reports for this medicine, compared with 14% across reports for all cat medicines.

248Reports
60%Marked serious
24%Recovered
23%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
99 47%
1–2 days
66 31%
3–7 days
22 10%
1–4 weeks
13 6.2%
Over a month
10 4.8%

How the animals did

Recovered
59 24%
Recovered with lasting effects
1 0.4%
Still unwell when reported
90 36%
Died
32 13%
Euthanised
25 10%
Not known
41 17%

Problems reported at the same time

Age of the animals

Under 1 year
55
1–3 years
34
4–7 years
43
8–11 years
58
12+ years
55

About this medicine

Type: medicine.

Questions owners ask

Can Isoflurane cause lethargy in cats?
248 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 1 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).

Lethargy with similar medicines

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