What is a contraindication for administering Nitroglycerin (NTG)?

Administering Nitroglycerin (NTG) is contraindicated in patients who have recently taken medications for erectile dysfunction (EDD), such as sildenafil (Viagra), tadalafil (Cialis), or vardenafil (Levitra). This is primarily due to the potential for severe hypotension (low blood pressure) that can occur when NTG is combined with these medications. Both NTG and EDD medications act as vasodilators, and when used together, they can lead to an exaggerated drop in blood pressure, which could be life-threatening.

When considering the other options, age over 65 is not a strict contraindication for NTG; rather, age alone does not affect the drug's safety unless accompanied by other medical conditions. A history of stroke is not a direct contraindication either, as NTG can be used in these patients under certain conditions. Similarly, a blood sugar level below 100 mg/dL does not have a direct impact on the appropriateness of NTG administration. Therefore, understanding the critical interaction between NTG and EDD medications is essential for ensuring patient safety.