Efficacy and Safety of Lacidipine and Amlodipine on Blood Pressure in Korean ISH Patients Aged 60 to 80 Years

Patients will receive lacidipine 4mg and amlodipine 5mg for initial 4 weeks. If SBP is less than 140mmHg at Week 4, subjects continue to take lacidipine 4mg and amlodipine 5mg. If SBP is ≥140mmHg at Week 4, the dose of lacidipine will be increased to 6mg and amlodipine will be increased to 10mg. If BP is not controlled under 140mmHg at Week 8, diuretics will be added. For 12 weeks of treatment period, subjects will be visit to clinic at every 4 weeks