1) The systoloic and diastolic blood pressure were decreased significantly(170.3±12.2mmHg vs 143.7±13.0mmHg p<0.01 and 104.7±5.9mmHg vs 87.8±6.5mmHg, p<0.01, respectively) but the heart rate was independant of amlodipine administration.

2) The systolic blood pressure was lowered by 20mmHg or more in 26(76.5%) of 34 patients and the diastolic pressure was lowered by 10mmHg or more in 26(76.5%) of 34 patients at 12 weeks after amlodipine administration.

3) The adverse effects of amlodipine were dizziness in 5, edema in 5, indigestion in 3, constipation in 2, headache, flushing, insomnia in 1 patient respectively and only one of them discontinued amlodipine administration due to severs facial flushing and skin eruption.