Azathioprine side effects in dogs

107 reports sent to the FDA between 2005 and 2026 involve Azathioprine in dogs. The most reported problems were liver problems, blood problems, lethargy. 64% were marked serious.

107Reports
64%Marked serious
7.5%Only medicine involved
20%Recovered
33%Died or euthanised
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About this medicine

Type: medicine.

Most reported side effects

33 31%
28 26%
21 20%
Leucocytosis
16 15%
Weight loss
12 11%
Kidney problems
12 11%
Weakness
12 11%
Breathing problems
11 10%
Elevated gamma-glutamyl transferase (ggt)
10 9.3%
Pale mucous membrane
10 9.3%
Low platelet count
9 8.4%
Neutrophilia
9 8.4%

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 dog still getting fleas or heartworm), not about a side effect.

Didn't work as expected
5 4.7%
Didn't stop fleas
1 0.9%

How soon problems started

Same day
13 19%
1–2 days
9 13%
3–7 days
4 5.7%
1–4 weeks
16 23%
Over a month
28 40%

Time from the first dose to the first sign, where both dates were reported (70 reports).

How the animals did

Recovered
17 16%
Recovered with lasting effects
4 3.7%
Still unwell when reported
28 26%
Died
15 14%
Euthanised
20 19%
Not known
23 21%

Breeds named most often

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

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