Behaviour change after Ormetoprim + Sulfadimethoxine in dogs

82 reports to the FDA describe behaviour change in dogs given Ormetoprim + Sulfadimethoxine. That is 9.4% of all reports for this medicine, compared with 2.5% across reports for all dog medicines, so it is reported unusually often with this medicine.

82Reports
4.9%Marked serious
9.8%Recovered
4.9%Died or euthanised
Same dayTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
15 58%
1–2 days
5 19%
3–7 days
3 12%
1–4 weeks
0 0.0%
Over a month
3 12%

How the animals did

Recovered
8 9.8%
Still unwell when reported
12 15%
Died
3 3.7%
Euthanised
1 1.2%
Not known
58 71%

Problems reported at the same time

Age of the animals

Under 1 year
18
1–3 years
27
4–7 years
16
8–11 years
13
12+ years
4

About this medicine

Type: medicine.

Questions owners ask

Can Ormetoprim + Sulfadimethoxine cause behaviour change in dogs?
82 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).

Behaviour change with similar medicines

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