Epoprostenol sodium with arginine-mannitol excipients ( epoprostenol AM ; Veletri [ Actelion Pharmaceuticals Ltd , Allschwil , Switzerland ] ) and epoprostenol sodium with glycine-mannitol excipients ( epoprostenol GM ; Flolan [ GlaxoSmithKline , Triangle Park , NC ] ) are intravenous treatments for pulmonary arterial hypertension ( PAH ) .