An Open-Label ProSpective MultiCENTer Study to Evaluate Safety and Tolerability of Dry Powder Inhaled Treprostinil in PH

Open-label, multicenter study which will evaluate the safety and tolerability of LIQ861 in subjects who have WHO Group 1 \& 3 PH. Cohort A will include approximately 60 subjects who have WHO Group 3 Pulmonary Hypertension associated with interstitial lung disease (PH-ILD) Cohort B will include approximately 20 subjects who have WHO Group 3 PH-ILD, have been on protocol specified dosing of inhaled treprostinil QID, not at treatment goal, and able to transition to LIQ861. The primary objective of this study is to evaluate the safety and tolerability of LIQ861 in subjects with WHO Group 1 \& 3 Pulmonary Hypertension (PH).