Phase 3 Open-Label Extension Study of TD-9855 for Treating Symptomatic nOH in Subjects With Primary Autonomic Failure

This is a Phase 3, multi-center, open-label study to evaluate the safety and tolerability of ampreloxetine in subjects with primary autonomic failures (MSA, PD, and PAF) and symptomatic nOH. The study consists of 3 periods: (i) 26-week treatment, (ii) 156-week treatment extension, and (iii) 2-week follow-up.