Bosentas 62.5 (active ingredient Bosentan) is used to treat Pulmonary Arterial Hypertension (PAH), a serious condition with high blood pressure in the lungs, by relaxing and widening blood vessels to improve blood flow, heart/lung function, exercise ability, and quality of life, and it’s also used for preventing painful finger/toe ulcers (digital ulcers) in systemic sclerosis.