Nitroglycerin Dosing for Acute Angina

Sublingual Tablet Dosing Protocol

If chest pain is unimproved or worsening after 5 minutes following the first dose, call 9-1-1 immediately to access emergency medical services BEFORE taking additional nitroglycerin, as recommended by the American Heart Association 1, 3
This represents a critical change from older protocols—the emphasis is now on early activation of emergency services rather than completing a full course of nitroglycerin first, according to the American College of Cardiology 1

Consider IV nitroglycerin for persistent anginal pain after sublingual nitrate therapy, or if acute coronary syndrome is accompanied by hypertension or pulmonary edema, as suggested by the American College of Cardiology 2
Use only in hemodynamically stable patients with systolic blood pressure ≥90 mm Hg, as recommended by the American College of Cardiology 2
Start at 10 mcg/min and titrate upward by 10 mcg/min every 3-5 minutes until pain relief or hemodynamic response occurs, according to the American College of Cardiology 2, 4
Commonly used ceiling dose is 200 mcg/min, though doses up to 300-400 mcg/min have been safely administered, as reported by the American College of Cardiology 4
Avoid in suspected right ventricular infarction, as recommended by the American College of Cardiology 2
Absolute contraindication: phosphodiesterase-5 inhibitor use within 24 hours (sildenafil/vardenafil) or 48 hours (tadalafil) due to risk of profound hypotension, MI, and death, as warned by the American College of Cardiology 2, 4
Tachyphylaxis develops after approximately 24 hours of continuous infusion, as noted by the American College of Cardiology 2, 4

Monitor blood pressure closely, especially in elderly patients, as recommended by the European Society of Cardiology 5

If pain persists after 3 tablets in 15 minutes, or if the pain is different than typically experienced, seek prompt medical attention, as this may indicate acute myocardial infarction rather than stable angina, according to the American Heart Association 1