This is an open-label study for patients who participated in the BPS-MR-PAH-201 study and have volunteered to continue treatment for PAH with BPS-MR tablets. Each patient will return to the clinic following enrollment in the study at 3, 6, and 12 months, and annually thereafter for assessment.~Currently enrolled patients may be invited to participate in an optional four times daily (QID) dosing substudy of BPS-MR with total daily dose of BPS-MR achieved previously in the main study. Patients will return to the clinic for baseline visit, week 12, and then will follow the visit schedule provided to them in BPS-MR-PAH-202 main study.
This is an open-label extension study for patients who participated in the BPS-MR-PAH-201 study.