Ambrisun Tablets are drugs that are used to treat pulmonary hypertension. Increased amounts of a certain natural chemical are suggested to be the cause of this illness. These tablets works by blocking the effects of endothelin-1, which helps to lower pulmonary blood pressure, reduce the progression of symptoms, and enhance your capacity to exercise. It should not be crushed, chewed, or broken. Take these medications by mouth once a day, with or without a meal, or as prescribed by your doctor.