NTG dose for hypertension
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Here is a summary of Nitroglycerin (NTG) dosing for hypertension, drawn from multiple authoritative sources:
NTG Dosing for Hypertension
IV Bolus (Push) — Hypertensive AHF / Vascular Phenotype
- 1–2 mg IV bolus, repeated every 5 minutes as needed
- Goal: 25% reduction in SBP
- This strategy outperforms continuous infusion in reducing ICU admission, intubation, and hospital LOS
- — Rosen's Emergency Medicine
IV Continuous Infusion
- Starting dose: 5–10 μg/min
- Titrate up to 200 μg/min (maintaining hemodynamic stability)
- If infusion is used as primary therapy (rather than bolus): start at 50–100 μg/min, titrate up or down as needed
- — Harrison's Principles of Internal Medicine 22E; Rosen's Emergency Medicine
Sublingual (SL)
- 400 μg per dose (tablet or spray)
- 100% bioavailable, rapidly absorbed
- Multiple doses may be needed to match the total dose of IV bolus strategy
- — Rosen's Emergency Medicine
Key Clinical Indications & Considerations
| Situation | Notes |
|---|---|
| Hypertension + ACS / coronary ischemia | NTG is preferred agent — favorable effects on collateral coronary blood flow and pulmonary gas exchange |
| Post-CABG hypertension | NTG preferred over nitroprusside |
| Hypertensive AHF (vascular phenotype) | High-dose IV bolus strategy preferred |
| Cocaine-induced hypertension | NTG is an option (along with phentolamine, nicardipine) |
| Renal/hepatic disease | NTG preferred over nitroprusside (no cyanide risk) |
| Inferior MI / RV infarction | Avoid or use with extreme caution — these patients are preload-dependent; NTG's venous dilation can precipitate severe hypotension |
| Severe HTN without ischemia | Sodium nitroprusside remains more potent; NTG reduces preload > afterload |
Mechanism Reminder
- Low doses → primarily venodilation (↓ preload)
- Higher doses → arterial dilation added (↓ afterload)
- Rebound hypertension on discontinuation is less likely than with nitroprusside
Sources: Rosen's Emergency Medicine; Harrison's Principles of Internal Medicine 22E; The Washington Manual of Medical Therapeutics; Morgan & Mikhail's Clinical Anesthesiology
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