Final answer:
Nitroglycerin tablets are commonly administered sublingually to quickly relieve chest pain during a myocardial infarction by acting as a vasodilator.
Step-by-step explanation:
The most common route for administering a nitroglycerin tablet is sublingually, which means under the tongue. This method is used to facilitate quick absorption into the bloodstream, providing rapid relief from chest pain associated with heart conditions. Nitroglycerin works as a vasodilator, releasing nitric oxide and endothelium-derived releasing factor, which relaxes the coronary vessel's smooth muscle, aiding in decreasing the chest pain during myocardial infarction (MI) or heart attacks. Sublingual administration of nitroglycerin is part of immediate treatments for myocardial infarction, which also include supplemental oxygen and aspirin.