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Dosing nitroglycerin for angina is about rapid, safe relief with small, repeated doses. Start at the first sign of chest pain by taking one sublingual tablet. If pain continues after about five minutes, take a second tablet. If there’s still pain after another five minutes (ten minutes total), take a third tablet. Do not exceed three doses in 15 minutes. If symptoms persist after the third dose or if the patient develops more severe symptoms, call emergency services immediately.

This approach provides quick relief while monitoring safety and ensuring urgent evaluation if the pain doesn’t resolve, which is crucial because ongoing chest pain could indicate a more serious event like a heart attack. Taking doses every 15 minutes for an hour would delay needed care and exceed safe dosing. Taking three tablets at once could cause dangerous drops in blood pressure. Waiting an hour to treat misses the window for prompt relief.