Lethargy after Sulfadimethoxine in cats

49 reports to the FDA describe lethargy in cats given Sulfadimethoxine. That is 15% of all reports for this medicine, compared with 14% across reports for all cat medicines.

49Reports
33%Marked serious
8.2%Recovered
24%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
4 18%
1–2 days
7 32%
3–7 days
2 9.1%
1–4 weeks
7 32%
Over a month
2 9.1%

How the animals did

Recovered
4 8.2%
Still unwell when reported
5 10%
Died
11 22%
Euthanised
1 2.0%
Not known
28 57%

Problems reported at the same time

14 29%
13 27%
13 27%
11 22%
Blood problems
7 14%
Dehydration
6 12%
Weakness
5 10%

Age of the animals

Under 1 year
37
1–3 years
5
4–7 years
0
8–11 years
2
12+ years
2

About this medicine

Type: medicine.

Questions owners ask

Can Sulfadimethoxine cause lethargy in cats?
49 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 3 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).

Lethargy with similar medicines

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