Pain after Isoflurane in cats

The FDA has received 27 reports of pain in cats after Isoflurane. That is 1.3% of all reports for this medicine, compared with 0.7% across reports for all cat medicines, so it is reported unusually often with this medicine.

27Reports

70%Marked serious

30%Recovered

11%Died or euthanised

Same dayTypical onset

How soon it started

Same day

11 52%

1–2 days

6 29%

3–7 days

3 14%

1–4 weeks

0 0.0%

Over a month

1 4.8%

How the animals did

Recovered

8 30%

Still unwell when reported

12 44%

Died

2 7.4%

Euthanised

1 3.7%

Not known

4 15%

Problems reported at the same time

12 44%

6 22%

4 15%

4 15%

Abnormal radiograph finding

4 15%

Lethargy

3 11%

Fever

3 11%

Weight loss

3 11%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Type: medicine.

Questions owners ask

Can Isoflurane cause pain in cats?: 27 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).

Pain with similar medicines

Pain after Ketamine 43 reports · 1.3% of its reports
Pain after Butorphanol 30 reports · 1.3% of its reports
Pain after Methylprednisolone 25 reports · 1.6% of its reports
Pain after Propofol 22 reports · 1.9% of its reports
Pain after Diphenhydramine 21 reports · 5.7% of its reports

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