Final answer:
Beta blockers or ß-blockers are a group of drugs that reduce the heart's workload by blocking receptors that increase heart rate, thereby reducing the heart's oxygen demand.
Step-by-step explanation:
The group of drugs that reduce the heart's oxygen demand by decreasing heart rate are known as ß-blockers, also referred to as beta blockers. These medications work by blocking the ß-receptors that lead to increased heart rate and vasoconstriction. By doing so, they allow blood vessels to dilate and prevent heart rate from rising, which can significantly improve cardiac function in those with heart conditions such as congestive heart failure or post-heart attack. Common ß-blockers include metoprolol and propranolol; metoprolol specifically targets the B1-receptor, while propranolol blocks ß-receptors more generally. Additionally, there are other types of blockers, such as alpha blockers and calcium channel blockers, which can also affect the sympathetic system and reduce heart workload.