HealthdirectFree Australian health advice you can count on.

• Caution should be exercised in patients with history of shingles or chickenpox, high blood pressure, heart disease, or blood vessel problems, severe infection, poor immunity, bone marrow depression, blo‍​‍‍‍​‍‍‍‍‍‍‍‍​‍od transfusion, any allergy, who are taking other medications, children, during pregnancy and breastfeeding. • It may cause drowsiness or dizziness, do not drive a car or operate machinery while taking this medication. • It may reduce platelet counts; avoid injury or bruising. • Avoid live vaccination while taking this medication. • Monitor complete blood counts regularly while taking this medication.