Went to the ER with extremely high BP, was given potasium, nitroglycerin, BP med. Today is first day on Lisinopril, and its the first in months that I have NOT had a headache! I feel great, although as I am typing this I feel I have to concentrate a little harder. But my energy is up and NO headache. So far so good, I will keep you posted on latter effects....if any.