Vomiting after Metronidazole in cats

79 reports to the FDA describe vomiting in cats given Metronidazole. That is 20% of all reports for this medicine, compared with 18% across reports for all cat medicines.

79Reports

51%Marked serious

39%Recovered

16%Died or euthanised

4 daysTypical onset

How soon it started

Same day

21 32%

1–2 days

8 12%

3–7 days

11 17%

1–4 weeks

13 20%

Over a month

12 18%

How the animals did

Recovered

31 39%

Still unwell when reported

21 27%

Died

8 10%

Euthanised

5 6.3%

Not known

14 18%

Problems reported at the same time

35 44%

32 41%

25 32%

11 14%

11 14%

11 14%

Didn't work as expected

7 8.9%

Liver problems

6 7.6%

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 vomiting in cats?: 79 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 4 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).

Vomiting with similar medicines

Vomiting after Cefovecin (Convenia) 1,400 reports · 16% of its reports
Vomiting after Amoxicillin + Clavulanate (Clavamox) 683 reports · 29% of its reports
Vomiting after Enrofloxacin (Baytril) 150 reports · 9.5% of its reports
Vomiting after Amoxicillin 132 reports · 26% of its reports
Vomiting after Doxycycline 38 reports · 15% of its reports

All reported side effects of Metronidazole in cats · Medicines most reported with vomiting