http://www.medications.com/effect/view/35362 It must be the HCTZ... I was on Lisinopril 20mg for a month with little avail to my bp. I'm 25 and prior to taking it I was at 150/120: during I was bouncing between that and 130/90ish. A Walk-In clinic doctor started me on Lisinopril/HCTZ 20/12.5 and withi