Sulfadimethoxine side effects in cats

317 reports sent to the FDA between 1995 and 2026 involve Sulfadimethoxine in cats. The most reported problems were diarrhea, lethargy, vomiting. 13% were marked serious.

317Reports
13%Marked serious
82%Only medicine involved
4.1%Recovered
16%Died or euthanised
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About this medicine

Type: medicine.

Most reported side effects

50 16%
49 15%
41 13%
25 7.9%
Wobbliness (ataxia)
17 5.4%
Seizures
14 4.4%
Blood problems
13 4.1%
Dehydration
12 3.8%
No sign
12 3.8%
Weight loss
12 3.8%
Weakness
10 3.2%
Tremors
10 3.2%
Behaviour change
9 2.8%
Accidental exposure
8 2.5%

Share = percentage of this medicine's reports that mention the problem. One report can list several problems.

Reports that it didn't work

Some reports are about the medicine not working (for example a cat still getting fleas or heartworm), not about a side effect.

Didn't stop worms
10 3.2%
Didn't stop fleas
1 0.3%
Didn't stop mites
1 0.3%

How soon problems started

Same day
20 21%
1–2 days
19 20%
3–7 days
11 11%
1–4 weeks
32 33%
Over a month
15 15%

Time from the first dose to the first sign, where both dates were reported (97 reports).

How the animals did

Recovered
13 4.1%
Still unwell when reported
44 14%
Died
50 16%
Euthanised
2 0.6%
Not known
208 66%

Breeds named most often

Popular breeds appear more often because there are more of them.

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