Psoriasis is also known as psoriasis, oral drugs mainly have immunosuppressants, Vitamin A acid drugs, specific drugs based on the severity of the disease, disease typing reasonable choice, there is no so-called preferred drugs. 1. Immunosuppressants: commonly used drugs are methotrexate, cyclosporine and so on. They are mainly applied to moderate and severe plaque-type, erythroderma-type, pustular-type and arthropathy-type psoriasis. 2. Vitamin A acid drugs: commonly used drugs are Avicenna, which plays a role in psoriasis by affecting the abnormal keratinization process and regulating cell proliferation and differentiation, and can be widely used in various types of psoriasis, such as plaque-type and pustular-type psoriasis. Psoriasis should go to the hospital in time for examination, follow the doctor’s instructions for standardized treatment, and avoid abusing drugs by yourself.