My 84 year old wife with Parkinson's and congestive heart failure has extremely labile blood pressure. She can have a systolic bp of 84 which leads to fainting and an hour later a systolic of 150!. Her bp meds are Norvasc, 5 mg, 1/day, Coreg, 40 mg, 1/day; Enalapril, 20 mg, 2/day.
She has had 4 fainting episodes in the past 15 months and has been very lucky that she has not seriously hurt herself as she fell.