Allergic reaction after Metronidazole in dogs

133 reports to the FDA describe allergic reaction in dogs given Metronidazole. That is 4.3% of all reports for this medicine, compared with 2.3% across reports for all dog medicines, so it is reported unusually often with this medicine.

133Reports
68%Marked serious
24%Recovered
12%Died or euthanised
1 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
62 50%
1–2 days
15 12%
3–7 days
19 15%
1–4 weeks
10 8.1%
Over a month
18 15%

How the animals did

Recovered
31 23%
Recovered with lasting effects
1 0.8%
Still unwell when reported
73 55%
Died
6 4.5%
Euthanised
10 7.5%
Not known
12 9.0%

Problems reported at the same time

Age of the animals

Under 1 year
18
1–3 years
52
4–7 years
27
8–11 years
16
12+ years
18

About this medicine

Metronidazole treats some bacterial and parasitic gut infections.

Questions owners ask

Can Metronidazole cause allergic reaction in dogs?
133 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).

Allergic reaction with similar medicines

All reported side effects of Metronidazole in dogs · Medicines most reported with allergic reaction