my aunt is hypertensive. her bp was 170/100 six months ago when she started takin amlodipin. she took amlodipine 5mg for 2 months and then the dose was reduced to half i.e 2.5 mg. but her bp still fluctuates from 130/100 to 110/80. recently her ECG showed probable sinus tachycardia with the heart rate of 110. should the medication be changed?