This is a single-center, randomized, double-blind, crossover trial, planning to enroll 90 patients with grade 1 and 2 hypertension in the Third Xiangya Hospital of Central South University. The participants will be divided into two groups randomly and treated with half-dose quadruple antihypertensive therapy (irbesartan 75mg+ metoprolol 23.75mg+ amlodipine 2.5mg+ indapamide 1.25mg) or with full-dose dual antihypertensive therapy (irbesartan 150mg+ amlodipine 5mg) for four weeks. After washing out with placebo for two weeks, the participants of the two groups will exchange their medication and be treated for another four weeks. The changes of blood pressure (including 24-hour ambulatory blood pressure, office blood pressure, and home blood pressure) and related adverse effects of the two groups will be compared.
This study aims to compare the antihypertensive effect of initial treatment with a single capsule containing quadruple combination of half-dose of blood pressure medicines or standard dose dual combination in patients with hypertension.