Bosentan

Bosentan is a medication used to treat pulmonary arterial hypertension, a condition where blood pressure in the lungs' arteries is abnormally high. It works by blocking certain substances in the body called endothelin receptors that cause blood vessels to narrow. By doing so, bosentan relaxes and widens the blood vessels in the lungs, improving blood flow and reducing the workload on the heart. This can help lessen symptoms like shortness of breath and increase exercise capacity. It is prescribed under medical supervision due to potential side effects and the need for regular liver function monitoring.