Hi thanks for writing here.Azoran is an immunosuppresive drug used mainly in organ transplantation with excllent results in skin particularly eczema and atopic dermatitis.It is a purine analogue and an enzyme thiopurine s methyl transferase( TPMT) required for most of its activation and deactivation steps,so there is always a chnace of devolping adverse effects in people having tpmt deficiency. It is always better to measure TPMT activity,so please ask your doctor to do assay if possible. Common adverse effects nasuea ,vomiting which usually occurs at the start of therapy.It can be reduced by taking drug after food.Measure concern is for bone marrow suprresion leading to aplastic anemia and repeated infections,so it is advised to check complete blood count regularly during treatment.Other less common side effects are diziness,diarrohea,skin rash etc. As far as drug peroid is considered it is decided by treating physcian himself,be in regular follow up with him,do regular blood check ups whenever he advises,consult him if you have fever, mouth ulcers etc.Eat healthy food,fresh citrus foods which will help to build your immune system.Take care.