While carrying out a surgery for the removal of Pheochromocytoma, there is a risk of abnormally high blood pressure. Prolee 40mg Tablet blocks the effect of some chemicals on your heart and blood vessels. This slows down the heart rate and helps the heart beat with less force thereby lowering your blood pressure. It is used for immediate reduction of very high blood pressure (hypertensive emergency). A controlled blood pressure reduces the risk of having a heart attack, stroke, or kidney problems.