To compare clinical efficacy and tolerance of fixed combinations of perindopril and indapamide (noliprel), capoten+hydrochlorotiaside (caposide) in arterial hypertension stage I-II of high and very high risk which failed prior monotherapy.A blind randomized trial in parallel groups recruited 40 patients (20 patients each). The patients received 1 tablet a day noliprel (2 mg/0.625 mg) or caposide (50 mg/25 mg) for 6 months. Target pressure patients were counted. Speed of the pulse wave, blood lipids and electrolytes, left ventricular myocardium posterior wall thickness were estimated.By antihypertensive efficacy and ability to reduce left ventricular hypertrophy and to improve arterial elasticity, low-dose fixed combination (noliprel) was not inferior to caposide (high-dose fixed combination) while by T/P noliprel was more effective than caposide, it lowered cholesterol more but potassium level--less.Noliprel has the the same with caposide antihypertensive efficacy and ability to diminish LVH. It has benefits by action on lipid and electrolyte indices.