In this study, the cost of having high blood pressure treated by French general practitioners was estimated, using an analysis of the computerized records for 28,015 patients with either hypertension or history of hypertension over three years. Costs due to visits, drugs, and complementary tests were included. The average annual cost of treatment was 597 euros (SD 377 euros). The annual average cost of drugs was 447 euros, and antihypertensive drugs 258 euros. The average annual cost of patients who were controlled throughout the period was 537 euros, patients who were normalized cost 595 euros, and patients who deteriorated cost 612 euros.