Study Status: Enrolling by invitation
Recruit Status: Enrolling by invitation
Study Type: Interventional
Official Title: Treatment of Hypotensive Patients Having a Unique Pattern of Autonomic Symptoms
Brief Summary: The purpose of this study is to try different medications in patients with low blood pressure and other problems with their involuntary (autonomic) nervous system. The pharmacological trials in this study will perhaps lead to more effective treatment. This study consists of single dose trials, dose selection trials, 5-day trials and chronic (approximately 2 months) trials.