Breathing problems after Metronidazole in dogs

278 reports to the FDA describe breathing problems in dogs given Metronidazole. That is 9.0% of all reports for this medicine, compared with 2.7% across reports for all dog medicines, so it is reported unusually often with this medicine.

278Reports
85%Marked serious
15%Recovered
45%Died or euthanised
5 daysTypical onset
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How soon it started

Same day
53 24%
1–2 days
41 18%
3–7 days
31 14%
1–4 weeks
53 24%
Over a month
45 20%

How the animals did

Recovered
37 13%
Recovered with lasting effects
4 1.4%
Still unwell when reported
82 29%
Died
54 19%
Euthanised
72 26%
Not known
29 10%

Problems reported at the same time

Age of the animals

Under 1 year
15
1–3 years
46
4–7 years
63
8–11 years
68
12+ years
86

About this medicine

Metronidazole treats some bacterial and parasitic gut infections.

Questions owners ask

Can Metronidazole cause breathing problems in dogs?
278 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).

Breathing problems with similar medicines

All reported side effects of Metronidazole in dogs · Medicines most reported with breathing problems