Comparison of the effect of nifedipine controlled-release tablet and nifedipine sustained-release tablet in the treatment of hypertension

Objective To investigate the clinical efficacy of nifedipine sustained-release formulation(SR)and nifedipine controlled-release(GITS)in the treatment of essential hypertension.Methods 160 patients with essential hypertension were randomly divided into two groups.The SR group was treated with SR 20 mg twice a day;GITS group was treated with GITS 30 mg once a day.All patients were given ambulatory blood pressure monitoring(ABPM)and observed the 24-hour average blood pressure,heart rate,changes in the trough/peak(T/P)values,and adverse reactions before and after treatment in two groups.Results The T/P value of systolic blood pressure(SBP)and diastolic(DBP)in the GITS group was 68.5％,74.6％,respectively,which were higher than those of SR group(57.2％,61.1％)(x2=6.32,7.05,all P＜0.05);GITS group was significantly lower than the SR group in heart rate(t=4.17,P＜0.05);Adverse reactions between two groups had no significant difference(x2=0.16,P＞0.05).Conclusion SR and GITS can effectively lower blood pressure,but GITS is more efficient,stable,safe,small impact on the heart rate. Key words: Nifedipine; Formulations; Hypertension; Efficacy