The document discusses the cardiovascular system and treatments for conditions like angina. It defines angina and describes different types. It then discusses various drug classes used to treat angina, including organic nitrates, calcium channel blockers, beta blockers, and dipyridamole. For each drug class, it explains the mechanism of action, effects, uses, and potential side effects. It also provides guidance on treating acute myocardial infarction and lists several reference pharmacology textbooks.