What is a key safety consideration when administering nitroglycerin?

• A. It is a vasodilator that can cause hypotension; if BP drops too low then it should be decreased or stopped
• B. It increases heart rate
• C. It is a diuretic
• D. It reduces preload only

Answer: (A)

Nitroglycerin is a potent vasodilator, so the main safety concern is its potential to lower blood pressure dramatically. When the vessels dilate, preload and overall vascular resistance drop, which can cause dizziness, fainting, or worse if the BP falls too far. Therefore, the key safety step is to monitor blood pressure closely and withhold or adjust the dose if blood pressure drops to a unsafe level. In practice, ensure the patient is seated or lying down during administration, check vitals before and after dosing, and stop the medication if systolic blood pressure falls below a safe threshold, then notify the clinician. It can also cause reflex tachycardia and headaches, and it should not be used with certain erectile dysfunction medications due to the risk of severe hypotension.