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Bosentan

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Abstract

▴ Bosentan is a nonpeptide, specific, competitive, dual antagonist at both endothelin receptor subtypes (ETA and ETB). Orally administered bosentan effectively prevents endothelin 1-induced vasoconstriction in pulmonary vessels in patients with pulmonary arterial hypertension.

▴ Improvement in exercise capacity from baseline was significantly greater with bosentan than with placebo in two phase III trials in patients with WHO functional class III or IV pulmonary arterial hypertension (primary or associated with connective tissue disease) despite treatment with vasodilators, diuretics, anticoagulants, cardiac glycosides, or supplemental oxygen. The beneficial effects of bosentan on exercise capacity were maintained for at least 20 weeks.

▴ Compared with placebo, bosentan led to a significantly greater improvement from pretreatment values in secondary efficacy end-points such as the Borg dyspnea index, WHO functional class, and cardiopulmonary hemodynamic parameters (cardiac index, pulmonary vascular resistance, pulmonary artery pressure, pulmonary capillary wedge pressure, mean right atrial pressure).

▴ Bosentan significantly reduced the incidence, and delayed the onset, of clinical worsening of pulmonary arterial hypertension compared with placebo.

▴ In published clinical trials, adverse events that occurred with similar or greater frequency with bosentan 125mg twice daily than with placebo included headache, syncope, flushing and abnormal hepatic function. Those that occurred less frequently with bosentan 125mg twice daily than with placebo included dizziness, worsening of symptoms of pulmonary arterial hypertension, cough and dyspnea.

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Correspondence to Amitabh Prakash.

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Prakash, A., Perry, C.M. Bosentan. Am J Cordiovosc Drugs 2, 335–342 (2002). https://doi.org/10.2165/00129784-200202050-00006

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