Imuran (azathioprine) is an immunosuppressive antimetabolite used to prevent the body from rejecting a transplanted kidney. Imuran is also used to treat symptoms of rheumatoid arthritis. Imuran is available in generic form. Common side effects of Imuran include:
upset stomach,
nausea,
vomiting,
diarrhea,
loss of appetite,
hair loss, or
skin rash.ell your doctor if you experience unlikely but serious side effects of Imuran including:
muscle loss,
hair loss,
cold/numbness in the fingers,
mouth sores,
difficult/painful swallowing, or
greasy stools.