%0 Journal Article %T Macitentan for the treatment of pulmonary arterial hypertension. %A Spikes L %A Williamson T %A Satterwhite L %J Drugs Today (Barc) %V 50 %N 6 %D Jun 2014 %M 24983588 %F 2.436 %R 10.1358/dot.2014.50.6.2146837 %X Macitentan is a novel, dual endothelin receptor antagonist recently approved for the treatment of WHO Group I pulmonary arterial hypertension. Its pharmacologic mechanism of action as well as the pharmacokinetics, pharmacodynamics and potential drug-drug interactions have been demonstrated in multiple phase I and II trials. The pivotal randomized, placebo-controlled, event-driven clinical trial revealed a significant reduction in morbidity. The most common adverse events were rarely clinically significant, nor did they result in a high rate of discontinuation. Of note, macitentan is contraindicated in pregnant women due to embryo-fetal toxicity.