Merck known as MSD outside of the United States and Canada, announced that the U.S. Food and Drug Administration (FDA) has approved sotatercept-csrk (U.S. Brand Name: WINREVAIR, for injection, 45mg, 60mg) for the treatment of adults with pulmonary arterial hypertension (PAH, World Health Organization [WHO] Group 1) to increase exercise capacity, improve WHO functional class (FC), and reduce the risk of clinical worsening events. WINREVAIR was previously granted Breakthrough Therapy Designation by the FDA.