Which of the following is a potential side effect of isosorbide dinitrate?

Isosorbide dinitrate is a medication commonly used to prevent angina pectoris by dilating blood vessels and improving blood flow. A significant side effect of this medication is hypotension, which refers to abnormally low blood pressure. The mechanism behind this side effect involves the vasodilatory action of isosorbide dinitrate, which can cause blood vessels to widen, leading to a decrease in systemic vascular resistance and subsequently lowering blood pressure.

Hypotension can manifest as dizziness, lightheadedness, or fainting, particularly when a person stands up quickly, due to the sudden drop in blood pressure. While dizziness is a related concern stemming from hypotension, the primary and direct side effect linked to isosorbide dinitrate use is the lowering of blood pressure itself. Therefore, hypotension is the most accurate representation of a potential side effect of isosorbide dinitrate.