It is mainly used for severe allergic diseases and autoimmune diseases. Applicable to: 1. Treatment of systemic lupus erythematosus, severe polymyositis and severe bronchial asthma, dermatomyositis, vasculitis. 2. Treatment of various acute severe bacterial infections, rheumatism, nephrotic syndrome, myasthenia gravis, etc. Chemicalbook3. Treatment of thrombocytopenic purpura, granulocytopenia, etc. 4. Treatment of exfoliative dermatitis, pemphigus, neurodermatitis, eczema and other serious skin diseases. 5. Rejection of organ transplantation. 6. For non-solid tumors such as acute lymphoid leukemia, malignant lymphoma, etc. 7. Treat certain eye conditions.