Updated July 2026 · 8 min read
Part of the ICU Emergencies Hub — browse every related guide in one place.
Etomidate is the induction agent anesthesia and emergency teams reach for when the patient cannot tolerate a drop in blood pressure. It is fast, brief, and remarkably kind to hemodynamics — but it carries one famous controversy every ICU nurse should understand. Here is the practical picture.
Etomidate is a GABA-A receptor modulator, like propofol, producing rapid loss of consciousness. Onset is under a minute and its effect lasts only a few minutes — ideal for creating intubating conditions. What sets it apart is its cardiovascular neutrality: it does not blunt sympathetic tone or drop systemic vascular resistance the way propofol does, so blood pressure and heart rate stay remarkably steady through induction.
| Use | Typical dose |
|---|---|
| RSI / induction | ~0.3 mg/kg IV push (range ~0.2–0.3) |
| Onset | < 1 minute |
| Duration | ~3–5 minutes |
Etomidate is a single-push induction drug — it is not run as a continuous ICU sedation infusion (precisely because of the adrenal issue below). It is almost always paired with a paralytic such as rocuronium or succinylcholine for RSI, and because it provides no analgesia, an opioid or ketamine is often added for the noxious stimulus of laryngoscopy.
Myoclonus. Involuntary muscle jerking is common on induction and can look dramatic. It is usually benign and brief, but it can complicate the intubation sequence — which is one reason a paralytic follows quickly.
Pain on injection. Common through peripheral IVs.
Nausea and vomiting. Postoperative nausea is more frequent than with some alternatives.
No analgesia and no sustained sedation. After the few minutes of effect wear off, the patient needs an ongoing sedation and analgesia plan — etomidate buys you the tube, not the ICU course. Have your post-intubation sedation ready.
| Agent | Hemodynamics | Notable trade-off |
|---|---|---|
| Etomidate | Very stable | Adrenal suppression, myoclonus |
| Ketamine | Stable/raises BP | Emergence, tachycardia, secretions |
| Propofol | Drops BP | Hypotension |
| Midazolam | Mild drop | Slower, less predictable |
For anyone on the CRNA path, etomidate is core induction pharmacology. You will use it for patients with limited cardiac reserve, hypovolemia, or hemodynamic fragility where propofol is too risky. Understanding its GABA mechanism, its cardiovascular neutrality, and the adrenal trade-off at the ICU bedside is the same knowledge you will apply choosing induction agents in the OR.
Etomidate is the stable-induction specialist: fast, brief, and gentle on blood pressure, at the cost of transient adrenal suppression and myoclonus. Use it to secure the airway in the fragile patient, remember it treats neither pain nor the ongoing ICU course, and stay alert to post-induction hypotension in sepsis. Learn it now and it carries into anesthesia practice.
This article is general educational information for licensed clinicians and students, not medical advice or a substitute for your institution's protocols, pharmacy guidance, or a provider's orders. Always follow facility policy and verify every dose independently.
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