Reference — Med-Surg
Hypertensive Crisis Medications Reference
The IV antihypertensives used to bring a hypertensive emergency down — in a controlled way, in a monitored setting. The right drug depends on the scenario; the wrong pace causes its own harm.
Educational use only. These are high-alert IV medications given by titration in monitored settings. Drug choice, dosing, and BP targets are provider-directed; this reference does not replace orders or pharmacy resources. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
IV Antihypertensives
| Drug | Class | Key use | Nursing caution |
|---|---|---|---|
| Nicardipine / Clevidipine | IV calcium channel blocker | Versatile first-line for most emergencies; smooth titration | Avoid in advanced heart failure (nicardipine); clevidipine is a lipid emulsion (egg/soy allergy) |
| Labetalol | Alpha + beta-blocker | Broad use incl. stroke, dissection (rate + BP control) | Avoid in bradycardia, heart block, decompensated HF, severe asthma |
| Esmolol | Short-acting beta-blocker | Rate control — especially aortic dissection (given first) | Very short half-life; bradycardia, bronchospasm |
| Sodium nitroprusside | Arterial + venous vasodilator | Potent, rapidly titratable; severe emergencies | CYANIDE/thiocyanate toxicity with prolonged/high-dose use (esp. renal/hepatic impairment); light-protect |
| Nitroglycerin | Venous (then arterial) vasodilator | Pulmonary edema, myocardial ischemia/ACS | Headache, hypotension; tolerance; avoid with recent PDE5 inhibitors |
| Hydralazine | Direct arterial vasodilator | Eclampsia/pregnancy, some emergencies | Reflex tachycardia; less predictable; not titratable like infusions |
The Lowering Target
For most hypertensive emergencies, lower the mean arterial pressure by ~10–20% in the first hour, then gradually toward goal over the next 23 hours — over-rapid lowering risks stroke, MI, and AKI. Exceptions: aortic dissection needs rapid control to SBP ~100–120 and HR 60–80 (beta-blocker first); acute ischemic stroke has its own permissive thresholds. Use continuous BP monitoring (often an arterial line) for titration.
NCLEX Pearls
- ✦Nicardipine/clevidipine and labetalol are versatile, titratable first-line IV agents for most emergencies.
- ✦Sodium nitroprusside is potent but risks CYANIDE/thiocyanate toxicity (prolonged/high-dose, renal/hepatic impairment) — protect from light.
- ✦Aortic dissection: beta-blocker (esmolol/labetalol) FIRST for rate, then a vasodilator — target SBP ~100–120, HR 60–80.
- ✦Nitroglycerin is preferred when there's pulmonary edema or myocardial ischemia.
- ✦Lower MAP only ~10–20% in the first hour for most emergencies — too fast causes hypoperfusion injury.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with Academy of Medical-Surgical Nurses (AMSN) · Current medical-surgical nursing standards. It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →