Abnormal pupil light reflex after Butorphanol in cats

22 reports to the FDA describe abnormal pupil light reflex in cats given Butorphanol. That is 1.0% of all reports for this medicine, compared with 0.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

22Reports

86%Marked serious

9.1%Recovered

32%Died or euthanised

1 daysTypical onset

How soon it started

Same day

9 43%

1–2 days

7 33%

3–7 days

3 14%

1–4 weeks

1 4.8%

Over a month

1 4.8%

How the animals did

Recovered

2 9.1%

Still unwell when reported

12 55%

Died

3 14%

Euthanised

4 18%

Not known

1 4.5%

Problems reported at the same time

Dilated pupils

11 50%

Eye or vision problems

9 41%

8 36%

7 32%

7 32%

4 18%

4 18%

4 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 Butorphanol cause abnormal pupil light reflex in cats?: 22 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).

Abnormal pupil light reflex with similar medicines

Abnormal pupil light reflex after Orbifloxacin 26 reports · 3.8% of its reports

All reported side effects of Butorphanol in cats · Medicines most reported with abnormal pupil light reflex