Systolic pressure refers to the pressure in the blood vessels when the heart contracts and pushes blood into the arteries. It normally increases with age. Abnormal systolic pressure is a major risk factor for conditions like heart disease and stroke. Symptoms of high systolic pressure include dizziness and headaches, while low systolic pressure causes reduced energy and concentration problems. Maintaining a normal systolic pressure of 120 mm Hg or lower through lifestyle changes like exercise, diet, avoiding smoking and limiting alcohol can help control blood pressure without medication for many people. For those who need medication, doctors can prescribe different drug classes including diuretics and ACE inhibitors to safely stabilize systolic pressure.