Bosentan

**Semantic type:** Pharmacologic Substance

**Definition:** A sulfonamide-derived, competitive and specific endothelin receptor antagonist with a slightly higher affinity for the endothelin A receptor than endothelin B receptor. Bosentan blocks the action of endothelin 1, an extremely potent endogenous vasoconstrictor and bronchoconstrictor, by binding to endothelin A and endothelin B receptors in the endothelium and vascular smooth muscle. Bosentan decreases both pulmonary and systemic vascular resistance and is particularly used in the treatment of pulmonary arterial hypertension.

**Synonyms:** - 4-(1,1-Dimethylethyl)-N-(6-(2-hydroxyethoxy)-5-(2-methoxyphenoxy)-(2,2'-bipyrimidin)-4-yl)benzenesulfornamide - BOSENTAN - Bosentan Monohydrate - Ro 47-0203 - Tracleer