Macitentan

Macitentan is an orally active, non-peptide endothelin receptor antagonist for the treatment of idiopathic pulmonary fibrosis and pulmonary arterial hypertension.
Macitentan is a member of the class of sulfamides in which the two amino groups of sulfonamide are substituted by 5-(4-bromophenyl)-6-{2-[(5-bromopyrimidin-2-yl)oxy]ethoxy}pyrimidin-4-yl and propyl groups. An orphan drug used for the treatment of pulmonary arterial hypertension. It has a role as an endothelin receptor antagonist, an antihypertensive agent and an orphan drug. It is an organobromine compound, a member of pyrimidines, an aromatic ether, a ring assembly and a member of sulfamides. It derives from an ethylene glycol and an ACT-132577.|Macitentan was approved in October 2013. It is indicated for patients with pulmonary arterial hypertension, and is marketed under the brand name Opsumit. Macitentan is an antagonist/blocker of endothelin receptors on blood vessels and smooth muscle, and, thus, blocks the stimulation of vasculature hypertrophy, inflammation, fibrosis, proliferation, and vasoconstriction. Similar to all drugs acting on the renin-angiotensin system, macitentan is associated with embryo and fetal toxicity, so it should not be used in pregnancy and has special precautions that must be followed for all females of child-bearing age.|Macitentan is an Endothelin Receptor Antagonist. The mechanism of action of macitentan is as an Endothelin Receptor Antagonist.|Macitentan is an endothelin receptor antagonist that is used in the therapy of pulmonary arterial hypertension (PAH). Macitentan has been associated with a low rate of serum enzyme elevations during therapy, but has yet to be implicated in cases of clinically apparent acute liver injury.|Macitentan is an orally available dual endothelin receptor (ETR) antagonist with potential antihypertensive and antineoplastic activity. Upon administration, macitentan and its metabolites block the binding of endothelin isoform 1 (ET-1) to type-A and type-B ETR on both the tumor cells and the endothelial cells in the tumor vasculature. This prevents ET-1 mediated signaling transduction which may decrease tumor cell proliferation, progression, and angiogenesis in tumor tissue. ET-1, a potent vasoconstrictor that plays an important role in inflammation and tissue repair, is, together with its receptors, overexpressed varyingly in many tumor cell types.