Prednisone is a glucocorticoid that inhibits the formation, releasing and activity of endogen inflammatory mediators, including prostaglandins, kinins, histamin, liposomal enzimes and complement cascade. It also alters the organism immune response. In haematopoetic system it decreases lymphocytes, eosinophils and basophils number, but increases neutrophils, thrombocytes and erythrocytes. Prednisone antagonises the vitamin D effect in calcium absorption from the digestive apparatus (osteoporosis manifestation) and it stimulates hydrochloric acid release. In central nervous system it acts as a promoter, by causing euphoria, psychosis and convulsions.