What is the common route for nitroglycerin under ICEMA standing orders?

• A. Sublingual tablet or spray.
• B. Oral tablet.
• C. Intravenous infusion.
• D. Topical patch.

Answer: (A)

Sublingual administration is the common route because it delivers nitroglycerin rapidly and reliably in the field. Placing the tablet or spray under the tongue allows quick absorption through the oral mucosa directly into the systemic circulation, bypassing the liver’s first-pass metabolism. This yields a fast onset of action—ideal for acute chest pain and suspected angina or myocardial infarction—so relief can begin within minutes and dosing can be repeated as needed under standing orders.

Oral tablets don’t work as well in this setting because they are absorbed slowly and inconsistently from the GI tract, delaying relief. Intravenous infusion requires IV access and monitoring, which isn’t as practical for initial EMS management under standing orders. Topical patches provide a slower, ongoing effect rather than rapid relief, making them unsuitable for acute treatment.