Dilated pupils after Isoflurane in cats

The FDA has received 170 reports of dilated pupils in cats after Isoflurane. That is 8.4% of all reports for this medicine, compared with 1.4% across reports for all cat medicines, so it is reported unusually often with this medicine.

170Reports
42%Marked serious
34%Recovered
12%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
98 64%
1–2 days
42 27%
3–7 days
7 4.5%
1–4 weeks
1 0.6%
Over a month
6 3.9%

How the animals did

Recovered
56 33%
Recovered with lasting effects
1 0.6%
Still unwell when reported
70 41%
Died
14 8.2%
Euthanised
6 3.5%
Not known
23 14%

Problems reported at the same time

Age of the animals

Under 1 year
34
1–3 years
28
4–7 years
38
8–11 years
24
12+ years
42

About this medicine

Type: medicine.

Questions owners ask

Can Isoflurane cause dilated pupils in cats?
170 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).

Dilated pupils with similar medicines

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