My daughter was prescribed 5mg. She was on the medication for 5 days to a week. When she started passing out. She went to emergency and they said when she sat down her heart beats went down to 43 beats a min. When she stood up, her heart rate went up to sixty something. So this problem only happened when she was sitting down. She stopped taking the pills and and now she has only gotten dizzy once in the last day and a half. Did you hear of this before?