Final answer:
Beta blockers and calcium channel blockers are types of drugs that can decrease heart rate.
Step-by-step explanation:
Beta blockers are drugs that decrease heart rate by blocking the beta receptors associated with vasoconstriction and cardioacceleration. They allow blood vessels to dilate and prevent the heart rate from increasing, which can improve cardiac function for individuals with cardiovascular disease. Examples of beta blockers include metoprolol and propranolol. Calcium channel blockers, another type of drug, can also decrease heart rate by inhibiting the movement of calcium ions into the cardiac muscle cells, thus reducing the strength of contraction.