Prednisone generally refers to prednisone acetate, allergic purpura if only temporarily taking prednisone acetate, you can stop the drug immediately, generally will not have an impact on the body, if long-term use of prednisone acetate, can not stop the drug immediately, easy to lead to the body to appear glucocorticoid lack of adverse reactions. 1. Henochromic purpura is a vascular allergic reaction disease, the skin can appear different degrees of purplish red rash, can be accompanied by single joint swelling and pain, hematuria, black stools and so on. Prednisone acetate belongs to the glucocorticoid hormone, can inhibit the hypothalamic-pituitary-adrenal axis, with the inhibition of immune response, anti-inflammatory and other effects, applicable to the combination of severe digestive tract lesions, nephrotic syndrome, acute nephritis of the allergic purpura. 2. If the patient is only taking prednisone acetate temporarily, the drug can be stopped immediately, generally will not affect the body. If it is taken for a long period of time and the patient becomes dependent on the hormone or the condition is not yet fully controlled, the sudden stopping of the drug will cause the condition to recur or deteriorate, which will easily lead to the body to experience the adverse reactions of glucocorticoid deficiency, such as nausea, vomiting, fatigue, low blood pressure, shock and so on. Therefore, it is recommended that patients with allergic purpura use prednisone acetate reasonably under the guidance of a doctor, and do not blindly adjust the drug regimen on their own to avoid adverse reactions.