Death after Sulfadimethoxine in cats

The FDA has received 51 reports of death in cats after Sulfadimethoxine. That is 16% of all reports for this medicine, compared with 8.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

51Reports
25%Marked serious
0.0%Recovered
96%Died or euthanised
8 daysTypical onset
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How soon it started

Same day
2 15%
1–2 days
4 31%
3–7 days
0 0.0%
1–4 weeks
6 46%
Over a month
1 7.7%

How the animals did

Died
47 92%
Euthanised
2 3.9%
Not known
2 3.9%

Problems reported at the same time

13 25%
Seizures
8 16%
Dehydration
7 14%
6 12%

Age of the animals

Under 1 year
42
1–3 years
2
4–7 years
0
8–11 years
0
12+ years
1

About this medicine

Type: medicine.

Questions owners ask

Can Sulfadimethoxine cause death in cats?
51 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 8 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).

Death with similar medicines

All reported side effects of Sulfadimethoxine in cats · Medicines most reported with death