Low blood pressure after Isoflurane in cats

The FDA has received 28 reports of low blood pressure in cats after Isoflurane. That is 1.4% of all reports for this medicine, compared with 0.1% across reports for all cat medicines, so it is reported unusually often with this medicine.

28Reports

64%Marked serious

11%Recovered

25%Died or euthanised

Same dayTypical onset

How soon it started

Same day

22 85%

1–2 days

3 12%

3–7 days

1 3.8%

1–4 weeks

0 0.0%

Over a month

0 0.0%

How the animals did

Recovered

3 11%

Still unwell when reported

8 29%

Died

2 7.1%

Euthanised

5 18%

Not known

10 36%

Problems reported at the same time

9 32%

8 29%

7 25%

6 21%

6 21%

5 18%

5 18%

5 18%

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 low blood pressure in cats?: 28 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).

Low blood pressure with similar medicines

Low blood pressure after Ketamine 23 reports · 0.7% of its reports
Low blood pressure after Butorphanol 24 reports · 1.1% of its reports
Low blood pressure after Propofol 20 reports · 1.7% of its reports

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