Final answer:
Angina patients may be harmed by adrenergic drugs due to their stimulatory effect on heart rate and blood pressure. Beta-blockers, on the other hand, are often used to manage angina by reducing heart workload. Calcium channel blockers are also beneficial in managing angina by improving blood flow.
Step-by-step explanation:
Angina is a medical condition characterized by chest pain due to reduced blood flow to the heart muscle, resulting in inadequate oxygen supply. Adrenergic drugs, or sympathomimetics, mimic the actions of adrenaline (epinephrine) and can increase heart rate and blood pressure which might be detrimental to individuals with angina. On the other hand, beta-blockers are classified as sympatholytic drugs and are commonly used to treat cardiovascular diseases by blocking the β-receptors associated with vasoconstriction and cardioacceleration, thereby sometimes helping to alleviate angina symptoms.
Cholinergic drugs, affecting the parasympathetic system, can also influence heart function, but their role in angina is not as direct as the adrenergic drugs. Generally, calcium channel blockers are preferred for reducing the strength of heart contractions and improving blood flow during angina episodes.