Lameness after Ormetoprim + Sulfadimethoxine in dogs

20 reports to the FDA describe lameness in dogs given Ormetoprim + Sulfadimethoxine. That is 2.3% of all reports for this medicine, compared with 0.6% across reports for all dog medicines, so it is reported unusually often with this medicine.

20Reports
10%Marked serious
0.0%Recovered
10%Died or euthanised
–Typical onset
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How the animals did

Still unwell when reported
5 25%
Died
2 10%
Not known
13 65%

Problems reported at the same time

7 35%
Muscle stiffness
4 20%
Arthritis
2 10%
Abnormal radiograph finding
2 10%

Age of the animals

Under 1 year
2
1–3 years
10
4–7 years
6
8–11 years
2
12+ years
0

About this medicine

Type: medicine.

Questions owners ask

Can Ormetoprim + Sulfadimethoxine cause lameness in dogs?
20 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.
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).

Lameness with similar medicines

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