Adrenal insufficiency is a clinical syndrome caused by insufficient secretion of hormones by the adrenal cortex, which is the result of a malfunction of one or more parts of the hypothalamic-pituitary-adrenal system [2]. Primary chronic adrenal insufficiency (1-CNI) develops as a result of the destruction of more than 90% of the cortex of both adrenal glands by a pathological process. The main causes of 1-CNN are currently autoimmune (80–85%) and tuberculosis (5–10%) destruction of the adrenal cortex [2, 3]. 1-CNN of the indicated etiology is better known as "Addison's disease." 1-CNN is a relatively rare disease (40-110 new cases per 1 million people per year) [2, 3], but it is of considerable importance in the practice of endocrinology. Without exception, all patients with a diagnosis of 1-chronic heart failure need lifelong replacement therapy with corticosteroids (CS), which will be discussed in this work.