Blood in vomit after Metronidazole in dogs

61 reports to the FDA describe blood in vomit in dogs given Metronidazole. That is 2.0% of all reports for this medicine, compared with 0.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

61Reports

70%Marked serious

15%Recovered

26%Died or euthanised

5 daysTypical onset

How soon it started

Same day

9 19%

1–2 days

8 17%

3–7 days

8 17%

1–4 weeks

10 21%

Over a month

12 26%

How the animals did

Recovered

9 15%

Still unwell when reported

27 44%

Died

7 11%

Euthanised

9 15%

Not known

9 15%

Problems reported at the same time

39 64%

37 61%

32 52%

24 39%

16 26%

15 25%

15 25%

12 20%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Metronidazole treats some bacterial and parasitic gut infections.

Questions owners ask

Can Metronidazole cause blood in vomit in dogs?: 61 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).

Blood in vomit with similar medicines

Blood in vomit after Amoxicillin + Clavulanate (Clavamox) 52 reports · 1.0% of its reports
Blood in vomit after Doxycycline 23 reports · 0.6% of its reports
Blood in vomit after Cefovecin (Convenia) 31 reports · 0.8% of its reports
Blood in vomit after Enrofloxacin (Baytril) 29 reports · 0.8% of its reports

All reported side effects of Metronidazole in dogs · Medicines most reported with blood in vomit