What is the main function of antianginal medications?

The main function of antianginal medications is to increase blood flow to the heart muscle. Angina is typically caused by reduced blood flow to the heart, often due to narrowed coronary arteries. Antianginal medications work by either dilating blood vessels or decreasing the heart's demand for oxygen, which helps alleviate the pain associated with angina. By enhancing blood flow, these medications ensure that the heart muscle receives the necessary oxygen and nutrients, preventing discomfort and potential damage.

Other options represent functions that do not pertain to the main action of antianginal medications. Blocking pain signals is typically associated with analgesics, which target pain directly rather than addressing the underlying issue of reduced blood flow. Relieving anxiety is not the primary purpose of antianginal medications, though some patients may experience anxiety related to angina symptoms. Protecting against infections relates to the use of antibiotics, which is entirely separate from the function of medications aimed at treating angina.