Final answer:
Musicians may use beta-blockers like metoprolol and propranolol to prevent performance-induced tremors and heart palpitations by blocking stress-related receptors in the heart.
Step-by-step explanation:
The drug musicians may take to prevent tremors and heart palpitations are beta-blockers. These medications are commonly used to treat cardiovascular issues by blocking β-receptors associated with vasoconstriction and cardioacceleration. This allows for the dilatation of blood vessels and helps in maintaining a steady heart rate. Beta-blockers can thus improve cardiac function, which is particularly beneficial in individuals with cardiovascular compromise. Moreover, musicians and others facing performance-induced anxiety might use them to manage physical symptoms such as trembling and a rapid heartbeat. Two common beta-blockers are metoprolol, which blocks the β1-receptor, and propranolol, which blocks β-receptors nonspecifically.