Breathing problems after Ormetoprim + Sulfadimethoxine in dogs

The FDA has received 43 reports of breathing problems in dogs after Ormetoprim + Sulfadimethoxine. That is 4.9% 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.

43Reports
16%Marked serious
14%Recovered
21%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
11 65%
1–2 days
2 12%
3–7 days
0 0.0%
1–4 weeks
2 12%
Over a month
2 12%

How the animals did

Recovered
6 14%
Still unwell when reported
10 23%
Died
9 21%
Not known
18 42%

Problems reported at the same time

Age of the animals

Under 1 year
2
1–3 years
12
4–7 years
14
8–11 years
9
12+ years
5

About this medicine

Type: medicine.

Questions owners ask

Can Ormetoprim + Sulfadimethoxine cause breathing problems in dogs?
43 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 the same 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).

Breathing problems with similar medicines

All reported side effects of Ormetoprim + Sulfadimethoxine in dogs · Medicines most reported with breathing problems