Introduction: Real-world data on the comparative effectiveness of endothelin receptor antagonists (ERAs; macitentan, bosentan, ambrisentan) for pulmonary arterial hypertension (PAH), particularly in Asian countries, are scarce. We evaluated the persistence of these ERAs before and after macitentan approval in Japan (2015). Methods: We used real-world data from the Japanese Medical Data Vision administrative claims database between April 2008 and November 2020. Patients with PAH were identified from the dataset. Persistence to ERA treatment before and after approval of macitentan in Japan was defined as the time between start of the index ERA and treatment discontinuation or death. Propensity score adjustment was applied to minimize confounding effects among treatment groups. Results: In the pre-macitentan approval cohort, 153 and 51 patients received bosentan and ambrisentan, respectively. In the postmacitentan approval cohort, 331, 284, and 91 patients received macitentan, bosentan, and ambrisentan, respectively. Unadjusted median These data were previously presented, in part, at the 8th Annual Meeting of the Japanese Society of Pulmonary Hypertension and Pulmonary Circulation General Presentation (JPCPHS23), June 3-4, 2023 in Kobe, Japan.Yogeshwar Makanji and David Bin-Chia Wu contributed equally.