Objective To evaluate the efficacy and safety of levamlodipine besylate and extended release nifedipine for patients with mild and moderate essential hypertension.

• 原发性高血压是一种慢性疾病,大量的循证医学证据表明,高血压是引发心、脑、肾血管并发症最重要、最直接的原因之一。