This document discusses cardiovascular drugs and their uses. It mentions that cardiovascular drugs act on the heart and blood vessels, and are widely used to treat conditions like hypertension, angina, heart failure, and arrhythmias. It provides glyceryl trinitrate as an example of an anti-anginal drug used to treat and prevent chest pain caused by angina or heart attacks. The document also contains questions about anti-anginals and organic nitrates, and provides information about drug classifications, brand names, and definitions of terms like cardiotonic drugs.