The development of new methods for the prevention and treatment of chronic heart failure and its control is an urgent medical and social problem. In this regard, using of new biological markers of the disease may be useful for early diagnosis of the disease, predict a clinical course, monitor the effects of pharmacotherapy (personalized medicine) and play an important role in stratifying the patient's risk. In 2013, according to the recommendation of the American Heart Association, a galectin-3 was introduced into the pool of such biomarkers for prevention and treatment of chronic heart failure. Objective: to improve prediction of the course and effectiveness of the therapy for hypertension and chronic heart failure as the hypertension complication in men 40-60 years old by applying the level of galectin-3 as a biomarker. There were observed the men 40-60 years old with hypertension and chronic heart failure for the concentration of galectin-3. Also, there were observed subjects without cardiovascular pathology (n=79), the men with hypertonic disease with myocardial hypertension (n=62) and the men with chronic heart failure II-III functional class of NYHA (n=50) for the indicators of central and systemic hemodynamics. The level of galectin-3 was determined by immunoassay analysis on the equipment "Stat Fact 300". Structural and functional parameters of myocardium were assessed by an ultrasound method using the equipment "RADMIR ULTIMARA". Data statistical analysis was performed on a personal computer using standard statistical package "Statistica 10.0". All data is presented in the form of average (M) and standard deviation (± σ). It has been established that the concentration of galectin-3 significantly decreases against the background of treatment. The level of galectin-3 in the patients with the II stage of hypertonic disease with good treatment effect was close to normal values compared to those with moderate treatment effect. In terms of patients with hypertension III stage, the level of galectin-3 also decreased, indicating the possibility of therapy monitoring using this biomarker. The mathematical model of the galectin-3 influencing factors also has been determined in patients with hypertension. The boundary level of the galectin-3 has been calculated, it is counted 46.51 pg/ml. It might be assumed a moderate effect of the treatment of hypertensive patients and chronic heart failure in males.