I have been taking Lisinopril for about 2 1/2 weeks now. My BP is at 118/78 from 145/85. I have been lightheaded now for about 3 days it is driving me nuts and I have no energy. I was taking Atenolol which did nothing for my BP and gave me no energy. Lisinopril has definately lowered my BP but I can't take this lightheaded feeling. I am actually waiting for my Dr. to call me.