
Beta-blockers slow your heart down
Beta-blockers can help people with high blood pressure (hypertension) and heart disease by blocking adrenaline, a hormone that stimulates the heartbeat. When adrenaline is blocked, the heart rate slows down, causing blood pressure to drop. Both heart rate and blood pressure increase during most exercises. Beta-blockers prevent these normal increases. People taking these medications may notice a decrease in endurance and that they feel drained and short of breath while working out. Carefully monitoring activity is recommended to avoid overexertion. Because low blood pressure can cause you to feel dizzy and unbalanced when you sit up or stand suddenly. Some doctors recommend avoiding sudden position changes while on beta blockers.