In chest pain management, if the first nitroglycerin dose reduces pain only slightly (e.g., from 9 to 8), what is the next drug to administer?

• A. Aspirin
• B. Oxygen
• C. Nitro again
• D. Morphine

Answer: (C)

The main idea is that nitrates are given in a titratable, stepwise way to relieve ischemia. If the first dose of nitroglycerin only slightly eases the pain, the next move is to repeat the nitro dose after about five minutes, assuming the patient’s blood pressure is still adequate and there are no contraindications. Each additional dose can further reduce preload and dilate coronary vessels, improving myocardial oxygen supply relative to demand and often providing more pain relief. Oxygen is added if there’s hypoxia, aspirin is given for its antiplatelet effect in suspected ACS, and morphine is reserved for persistent pain after nitrates or when nitrates alone aren’t sufficient—since morphine can depress respiration and lower blood pressure. So, the best next drug to administer is another nitroglycerin dose.