Why administer nitroglycerin sublingually?

Nitroglycerin is administered sublingually because this route allows for rapid absorption directly into the bloodstream through the mucous membranes, providing quick relief from angina pectoris. The sublingual formulation bypasses the digestive system and first-pass metabolism in the liver, ensuring that the medication acts swiftly. This method is particularly effective for acute episodes, as it can alleviate chest pain within minutes.