Hyperphosphataemia after Isoflurane in cats

35 reports to the FDA describe hyperphosphataemia in cats given Isoflurane. That is 1.7% of all reports for this medicine, compared with 1.0% across reports for all cat medicines, so it is reported unusually often with this medicine.

35Reports

94%Marked serious

8.6%Recovered

46%Died or euthanised

2 daysTypical onset

How soon it started

Same day

10 34%

1–2 days

13 45%

3–7 days

2 6.9%

1–4 weeks

4 14%

Over a month

0 0.0%

How the animals did

Recovered

3 8.6%

Still unwell when reported

10 29%

Died

6 17%

Euthanised

10 29%

Not known

6 17%

Problems reported at the same time

34 97%

24 69%

16 46%

16 46%

13 37%

12 34%

12 34%

11 31%

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 hyperphosphataemia in cats?: 35 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 2 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).

Hyperphosphataemia with similar medicines

Hyperphosphataemia after Ketamine 38 reports · 1.2% of its reports
Hyperphosphataemia after Butorphanol 43 reports · 1.9% of its reports
Hyperphosphataemia after Methylprednisolone 20 reports · 1.2% of its reports
Hyperphosphataemia after Propofol 27 reports · 2.3% of its reports
Hyperphosphataemia after Molidustat 28 reports · 4.6% of its reports

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