Which medication is commonly used to treat angina pectoris?

Nitroglycerine is a widely used medication for treating angina pectoris because it works by relaxing and dilating blood vessels, which increases blood flow to the heart muscle. Angina pectoris occurs when the heart does not receive enough oxygen-rich blood, often due to narrowed coronary arteries. By expanding these blood vessels, nitroglycerine alleviates chest pain associated with angina, allowing the heart to receive adequate oxygen.

Other medications listed, like aspirin, are helpful in preventing blood clots but do not specifically address anginal pain. Beta-blockers can be used to reduce heart rate and oxygen demand, ultimately helping with angina in some cases, but they are not the first-line treatment for immediate relief of anginal episodes. Antibiotics are unrelated to angina management and are used to treat infections rather than heart conditions. Thus, nitroglycerine stands out as the primary medication designed for the acute treatment of angina.