What is the typical onset time for sublingual nitroglycerin?

What is the typical onset time for sublingual nitroglycerin?

• A. Onset within 3-5 minutes
• B. Onset within 1-3 minutes
• C. Onset within 10-15 minutes
• D. Immediate effect

Answer: (B)

Sublingual nitroglycerin works so quickly because it is absorbed directly through the mucous membranes under the tongue, bypassing the liver on the first pass and entering the bloodstream fast. This rapid absorption allows for quick vasodilation and relief of angina symptoms. The typical onset is within 1–3 minutes, which is why that option is the best. If the tablet is swallowed, absorption is much slower and onset is delayed, which is not the rapid response we expect from sublingual administration. It isn’t instantaneous, and waiting 10–15 minutes would be far longer than normal.

Sublingual nitroglycerin works so quickly because it is absorbed directly through the mucous membranes under the tongue, bypassing the liver on the first pass and entering the bloodstream fast. This rapid absorption allows for quick vasodilation and relief of angina symptoms. The typical onset is within 1–3 minutes, which is why that option is the best. If the tablet is swallowed, absorption is much slower and onset is delayed, which is not the rapid response we expect from sublingual administration. It isn’t instantaneous, and waiting 10–15 minutes would be far longer than normal.