Corticosteroids such as prednisone help suppress the immune system and reduce inflammation of the blood vessels. Common side effects include weight gain, risk of infection and osteoporosis. Other drugs that suppress your immune system include cyclophosphamide, azathioprine (Azasan, Imuran), mycophenolate (CellCept) and methotrexate (Trexall). Rituximab (Rituxan) is another option for treating granulomatosis with polyangiitis. It's given by injection, and often is combined with corticosteroids. Once your condition is controlled, you might remain on some drugs long term to prevent relapse. These include rituximab, methotrexate, azathioprine and mycophenolate. Side effects of immune-suppressing drugs include increased risk of infection. Cyclophosphamide can cause nausea, diarrhea and hair loss. Your doctor may prescribe other drugs to help prevent side effects from prescribed treatments.
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