Bosetan 62.5 Tablet contains Bosentan, and an endothelin receptor antagonist used to treat pulmonary arterial hypertension. It works by blocking the action of endothelin.  Endothelin narrows the blood vessels and increases the pressure in the blood vessels of the lungs. Bosetan 62.5 Tablet helps to relax blood vessels by blocking endothelin and increasing the blood supply to the lungs. Treatment of Pulmonary arterial hypertension (PAH) Bosetan 62.5 Tablet is an anti-hypertension medication primarily used to treat pulmonary arterial hypertension (high pressure in the blood vessels that carry blood from the heart to the lungs). Bosetan 62.5 Tablet can even increase our exercising ability, delay disease progression, and improve quality of life. It works by blocking the action of endothelin.  Endothelin narrows the blood vessels and increases the pressure in the blood vessels of the lungs. Bosetan 62.5 Tablet helps to relax blood vessels by blocking endothelin and increasing the blood supply to the lungs. It also improves the quality of life, exercising ability, and delays the progression of pulmonary arterial hypertension.