How long after the first dose should the second dose be given to adults on standing orders?

How long after the first dose should the second dose be given to adults on standing orders?

• A. Immediately after the first dose
• B. Five minutes after the first dose
• C. Ten minutes after the first dose
• D. One hour after the first dose

Answer: (B)

Five minutes after the first dose. When nitroglycerin is used under standing orders for adults with chest pain, you give a second dose only after a five-minute reassessment if the pain persists and the patient’s blood pressure remains adequate. This interval matches how nitroglycerin works—it begins to relieve ischemia relatively quickly, with effects evident within a few minutes—so you have a short window to judge response and ensure safety before giving more. Giving the second dose immediately wouldn’t allow time to evaluate effects and could raise the risk of hypotension; waiting ten minutes or an hour would unnecessarily delay relief and worsen potential ischemia.

Five minutes after the first dose. When nitroglycerin is used under standing orders for adults with chest pain, you give a second dose only after a five-minute reassessment if the pain persists and the patient’s blood pressure remains adequate. This interval matches how nitroglycerin works—it begins to relieve ischemia relatively quickly, with effects evident within a few minutes—so you have a short window to judge response and ensure safety before giving more. Giving the second dose immediately wouldn’t allow time to evaluate effects and could raise the risk of hypotension; waiting ten minutes or an hour would unnecessarily delay relief and worsen potential ischemia.