Tarry or black stool after Butorphanol in dogs

24 reports to the FDA describe tarry or black stool in dogs given Butorphanol. That is 0.5% of all reports for this medicine, compared with 0.1% across reports for all dog medicines, so it is reported unusually often with this medicine.

24Reports

67%Marked serious

21%Recovered

46%Died or euthanised

5 daysTypical onset

How soon it started

Same day

3 13%

1–2 days

5 22%

3–7 days

5 22%

1–4 weeks

6 26%

Over a month

4 17%

How the animals did

Recovered

5 21%

Still unwell when reported

8 33%

Died

6 25%

Euthanised

5 21%

Problems reported at the same time

14 58%

13 54%

11 46%

9 38%

8 33%

6 25%

6 25%

6 25%

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 tarry or black stool in dogs?: 24 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 5 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).

Tarry or black stool with similar medicines

Tarry or black stool after Polysulfated Glycosaminoglycan 26 reports · 0.5% of its reports
Tarry or black stool after Tramadol 48 reports · 1.3% of its reports
Tarry or black stool after Famotidine 56 reports · 2.1% of its reports
Tarry or black stool after Sucralfate 58 reports · 5.9% of its reports
Tarry or black stool after Omeprazole 22 reports · 2.3% of its reports

All reported side effects of Butorphanol in dogs · Medicines most reported with tarry or black stool