Introduction: Hypertension is a chronic disease that impairs vital organs and alters the quality of life of patients, who must remain in drug treatment with hypotensive and vasodilator medicine to control their blood pressure. Objective: To determine the degree of adherence of chronic hypertensive patients to ongoing drug therapy, as well as the relationship between their habits and attitudes with this chronic disease. Methodology: Through a quantitative, descriptive and cross-sectional study based on the Morisky-Green test, a multivariate analysis of outpatients attending the hypertension control program in the Jorge Cristo Sahium Hospital, Villa del Rosario, Norte de Santander, Colombia was performed. Results: The total amount of people included in the program is of 563 patients, among which a representative sample of 154 was chosen; 87.34 % were women and 12.66% were men; the average age was of 66.295 ± 11.393 years, and 62 (39.74%) patients completed the treatment. Conclusions: The most commonly used drugs for high blood pressure were those from the antagonist pharmacological group of angiotensin II receptors (ARA II) and the angiotensin-convertingenzyme inhibitors (ACE inhibitors), together with diuretics and antiplatelet agents. Patients often discontinue their medications for certain periods of time, which causes their nonadherence to pharmacotherapy. [ABSTRACT FROM AUTHOR]