|ATC code||C02KX01 (WHO)|
|Biological half-life||5 hours|
|Chemical and physical data|
|Molar mass||551.614 g/mol|
|3D model (Jmol)||Interactive image|
|(what is this?)|
Bosentan is a dual endothelin receptor antagonist used in the treatment of pulmonary artery hypertension (PAH). It is licensed in the United States, the European Union and other countries by Actelion Pharmaceuticals for the management of PAH under the trade name Tracleer.
Bosentan is indicated mainly for the treatment of pulmonary hypertension. In 2007, Bosentan was also approved in the European Union for reducing the number of new digital ulcers in patients with systemic sclerosis and ongoing digital ulcer disease.
In the United States, Bosentan is indicated for the treatment of pulmonary arterial hypertension (WHO Group I) in patients with WHO Class II-IV symptoms, to improve exercise capacity and decrease the rate of clinical worsening.
Bosentan is contraindicated in pregnancy because of its teratogenicity (Pregnancy Category X).
Mechanism of action
Bosentan is a competitive antagonist of endothelin-1 at the endothelin-A (ET-A) and endothelin-B (ET-B) receptors. Under normal conditions, endothelin-1 binding of ET-A or ET-B receptors causes constriction of the pulmonary blood vessels. By blocking this interaction, bosentan decreases pulmonary vascular resistance. Bosentan has a slightly higher affinity for ET-A than ET-B.
- Funke C, Farr M, Werner B, Dittmann S, Uberla K, Piper C, Niehaus K, Horstkotte D (Apr 2010). "Antiviral effect of Bosentan and Valsartan during coxsackievirus B3 infection of human endothelial cells.". Journal of General Virology. 91 (8): 1959–1570. doi:10.1099/vir.0.020065-0. PMID 20392896.