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Home > Drugs > Etomidate (monograph)
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Etomidate (monograph)

https://themeditary.com/drug/etomidate-monograph-15919.html
Medically Reviewed by Glamora Samuels, MD TheMediTary.Com | Reviewed: Sep 22, 2023  Additional Content by TheMediTary.Com

Generic name: amidate

Availability: Prescription only

Pregnancy & Lactation: Risk data not available

Contents
Uses Warnings Before Taking Dosage Side effects Interactions

What is Etomidate (monograph)?

Introduction

Sedative and hypnotic agent used for general anesthesia.

Uses for Etomidate

Induction of Anesthesia

Used for induction of general anesthesia. Induction results in dose-related hypnotic effects (progressing from light sleep to unconsciousness).

Particularly useful in patients with compromised cardiopulmonary function because of minimal hemodynamic effects and decreased respiratory depressant effects relative to other IV anesthetics (e.g., barbiturates, propofol).

Carefully weigh potential benefits of the drug’s hemodynamic effects against possible risk of myoclonus. (See Common Adverse Effects under Cautions.)

Maintenance of Anesthesia

May be used during maintenance of anesthesia to supplement subpotent anesthetic agents (e.g., nitrous oxide and oxygen) during short surgical procedures (e.g., dilatation and curettage, cervical conization). Use for longer procedures not recommended due to risk of prolonged adrenal suppression. (See Adrenal Suppression under Cautions.)

Rapid Sequence Intubation

Commonly used for rapid sequence intubation because of rapid onset of action and favorable hemodynamic profile. However, risk of adrenal suppression may limit use in critically ill patients (particularly those with sepsis).

Procedural Sedation

Has been used for procedural sedation† [off-label]. Because of its short duration of action, the drug is best suited for short procedures.

Time to onset of sedation and recovery with etomidate are comparable to those achieved with propofol, but considerably shorter than with midazolam. However, etomidate is associated with increased risk of myoclonus and pain at the injection site compared with other sedative agents. Although respiratory depression or apnea reported in some patients, incidence is generally the same or less than with other sedative agents.

Etomidate Dosage and Administration

General

Administration Precautions

Administer only by individuals experienced in the use and management of possible complications of general anesthetic agents.

Premedication

  • May administer premedications such as benzodiazepines (to relieve anxiety and produce anterograde amnesia) and opiate agonists (to relieve pain) as appropriate.

Administration

Administer by IV injection.

May be administered by intraosseous (IO) injection† [off-label] in the setting of pediatric rapid sequence intubation.

Has been administered by continuous IV infusion† [off-label]; however, this method of delivery is not recommended because of risk of adrenal toxicity. (See Adrenal Suppression under Cautions.)

Limited data indicate that inadvertent intra-arterial administration of etomidate injection does not appear to be associated with tissue necrosis distant from the injection site; however, intra-arterial use of the drug is not recommended.

IV Administration

Administer undiluted by direct IV injection.

Administer into larger, more proximal, veins of the forearm, rather than the smaller, distal hand or wrist veins to minimize pain at injection site.

To prevent needlestick injuries, do not recap, bend, or break needles by hand.

Rate of Administration

For induction of anesthesia, administer by rapid (over 30–60 seconds) IV injection in children >10 years of age and adults.

Dosage

Because individual response is variable, adjust dosage according to individual requirements and response, age, physical and clinical status, underlying pathologic conditions (e.g., shock, intestinal obstruction, malnutrition, anemia, burns, advanced malignancy, ulcerative colitis, uremia, alcoholism), and the type and amount of premedication or concomitant medication(s). Titrate dosage according to clinical effect.

Pediatric Patients

Induction of Anesthesia
IV

Children >10 years of age: 0.3 mg/kg (0.2–0.6 mg/kg).

Maintenance of Anesthesia
IV

Use smaller increments than those used for induction.

Rapid Sequence Intubation
IV or IO† [off-label]

Manufacturers state inadequate data to make dosage recommendations for pediatric patients <10 years of age. In published reports, average dose of 0.3 mg/kg has been used in pediatric patients as young as 18 days of age.

Some clinicians recommend a dose of 0.3 mg/kg by IV or IO† [off-label] injection for pediatric rapid sequence intubation.

Procedural Sedation†
IV

Doses are usually less than those used for induction of anesthesia; in clinical studies, initial etomidate dose of 0.1–0.2 mg/kg usually administered, followed by additional doses of 0.05–0.1 mg/kg as needed (average total dose of up to 0.26 mg/kg per procedure).

Some studies have found that a dose of 0.2 mg/kg was most effective initial dose for short pediatric procedures in the emergency department.

Adults

Induction of Anesthesia
IV

0.3 mg/kg (0.2–0.6 mg/kg).

Maintenance of Anesthesia
IV

Use smaller increments than those used for induction.

Rapid Sequence Intubation
IV

Usual dose of 0.3 mg/kg.

Procedural Sedation†
IV

Doses are usually less than those used for induction of anesthesia; in clinical studies, initial etomidate dose of 0.1–0.2 mg/kg usually administered, followed by additional doses of 0.05–0.1 mg/kg as needed (average total dose of up to 0.26 mg/kg per procedure).

Special Populations

Geriatric Patients

Geriatric patients may require lower dosages than younger patients because of pharmacokinetic differences (e.g., reduced protein binding and reduced clearance).

Warnings

Contraindications

  • Known hypersensitivity to etomidate.

Warnings/Precautions

Administration Precautions

To minimize risk of adverse effects, follow recommendations for administration and monitoring of etomidate therapy. (See Dosage and Administration.)

Adrenal Suppression

Causes adrenal suppression by inhibiting 11-β-hydroxylase activity, the enzyme responsible for production of cortisol and aldosterone.

Decreased plasma concentrations of cortisol (which usually persist for 6–8 hours and are unresponsive to stimulation by corticotropin [ACTH]) reported following IV administration of a single 0.3-mg/kg induction dose.

Because of risk of prolonged adrenal suppression, do not administer as a continuous IV infusion.

Although it is well established that etomidate causes adrenal suppression, there is controversy regarding the clinical importance. While evidence from one study showed increased mortality in critically ill patients (e.g., sepsis patients), other studies have not found such an association.

Specific Populations

Pregnancy

No adequate and well controlled studies in pregnant women; reduced pup survival and maternal toxicity observed in animal reproduction studies.

Based on animal data, repeated or prolonged use of general anesthetics and sedation drugs, including etomidate, during the third trimester of pregnancy may result in adverse neurodevelopmental effects in the fetus. (See Pediatric Use under Cautions and also see Advice to Patients.)

Insufficient data to support use during labor and delivery; not recommended for obstetric use (e.g., cesarean section).

Lactation

Not known whether etomidate is distributed into milk. Use with caution.

Pediatric Use

Manufacturers state safety and efficacy not established in children <10 years of age. However, the drug has been used for rapid sequence intubation in pediatric patients as young as 18 days of age. Also has been used in children of all ages for procedural sedation† in the emergency department.

Repeated or prolonged use of general anesthetics and sedation drugs, including etomidate, in children <3 years of age or during the third trimester of pregnancy may adversely affect neurodevelopment. In animals, use for >3 hours of anesthetic and sedation drugs that block N-methyl-d-aspartic acid (NMDA) receptors and/or potentiate GABA activity leads to widespread neuronal apoptosis in the brain and long-term deficits in cognition and behavior; clinical relevance to humans is unknown.

Some evidence suggests similar deficits may occur in children following repeated or prolonged exposure to anesthesia early in life. Some evidence also indicates that a single, relatively brief exposure to general anesthesia in generally healthy children is unlikely to cause clinically detectable deficits in global cognitive function or serious behavioral disorders. Most studies to date have substantial limitations; further research needed to fully characterize effects, particularly for prolonged or repeated exposures and in more vulnerable populations (e.g., less healthy children).

Consider benefits and potential risks when determining the timing of elective procedures requiring anesthesia. FDA states that medically necessary procedures should not be delayed or avoided. (See Advice to Patients.)

Geriatric Use

Cardiac depression (decreased heart rate and cardiac index) and decreased mean arterial BP may occur in geriatric patients receiving etomidate, especially in those with hypertension.

Since geriatric patients may have decreased renal function, monitor renal function and select dosage carefully. (See Special Populations under Dosage and Administration and see Renal Impairment under Cautions.)

Hepatic Impairment

Metabolized by the liver; patients with hepatic insufficiency may be at higher risk of adverse effects (e.g., adrenal insufficiency).

Renal Impairment

Substantially excreted by the kidneys. Risk of severe adverse reactions may be increased in patients with impaired renal function.

Common Adverse Effects

Injection site pain, skeletal muscle movements (e.g., myoclonic, averting, tonic, or ocular movements), postoperative nausea and vomiting.

Myoclonus occurs frequently. Most episodes are mild to moderate in severity, although disturbing movements reported occasionally. Usually bilateral. Administration of IV fentanyl immediately before induction has been shown to minimize incidence of skeletal muscle movements.

How should I use Etomidate (monograph)

General

Administration Precautions

Administer only by individuals experienced in the use and management of possible complications of general anesthetic agents.

Premedication

  • May administer premedications such as benzodiazepines (to relieve anxiety and produce anterograde amnesia) and opiate agonists (to relieve pain) as appropriate.

Administration

Administer by IV injection.

May be administered by intraosseous (IO) injection† [off-label] in the setting of pediatric rapid sequence intubation.

Has been administered by continuous IV infusion† [off-label]; however, this method of delivery is not recommended because of risk of adrenal toxicity. (See Adrenal Suppression under Cautions.)

Limited data indicate that inadvertent intra-arterial administration of etomidate injection does not appear to be associated with tissue necrosis distant from the injection site; however, intra-arterial use of the drug is not recommended.

IV Administration

Administer undiluted by direct IV injection.

Administer into larger, more proximal, veins of the forearm, rather than the smaller, distal hand or wrist veins to minimize pain at injection site.

To prevent needlestick injuries, do not recap, bend, or break needles by hand.

Rate of Administration

For induction of anesthesia, administer by rapid (over 30–60 seconds) IV injection in children >10 years of age and adults.

Dosage

Because individual response is variable, adjust dosage according to individual requirements and response, age, physical and clinical status, underlying pathologic conditions (e.g., shock, intestinal obstruction, malnutrition, anemia, burns, advanced malignancy, ulcerative colitis, uremia, alcoholism), and the type and amount of premedication or concomitant medication(s). Titrate dosage according to clinical effect.

Pediatric Patients

Induction of Anesthesia
IV

Children >10 years of age: 0.3 mg/kg (0.2–0.6 mg/kg).

Maintenance of Anesthesia
IV

Use smaller increments than those used for induction.

Rapid Sequence Intubation
IV or IO† [off-label]

Manufacturers state inadequate data to make dosage recommendations for pediatric patients <10 years of age. In published reports, average dose of 0.3 mg/kg has been used in pediatric patients as young as 18 days of age.

Some clinicians recommend a dose of 0.3 mg/kg by IV or IO† [off-label] injection for pediatric rapid sequence intubation.

Procedural Sedation†
IV

Doses are usually less than those used for induction of anesthesia; in clinical studies, initial etomidate dose of 0.1–0.2 mg/kg usually administered, followed by additional doses of 0.05–0.1 mg/kg as needed (average total dose of up to 0.26 mg/kg per procedure).

Some studies have found that a dose of 0.2 mg/kg was most effective initial dose for short pediatric procedures in the emergency department.

Adults

Induction of Anesthesia
IV

0.3 mg/kg (0.2–0.6 mg/kg).

Maintenance of Anesthesia
IV

Use smaller increments than those used for induction.

Rapid Sequence Intubation
IV

Usual dose of 0.3 mg/kg.

Procedural Sedation†
IV

Doses are usually less than those used for induction of anesthesia; in clinical studies, initial etomidate dose of 0.1–0.2 mg/kg usually administered, followed by additional doses of 0.05–0.1 mg/kg as needed (average total dose of up to 0.26 mg/kg per procedure).

Special Populations

Geriatric Patients

Geriatric patients may require lower dosages than younger patients because of pharmacokinetic differences (e.g., reduced protein binding and reduced clearance).

What other drugs will affect Etomidate (monograph)?

Specific Drugs

Drug

Interaction

Comments

Neuromuscular blocking agents

Etomidate does not alter usual dosage requirements of neuromuscular blocking agents

Opiate agonists (e.g., fentanyl)

Potential additive pharmacologic effect

Dosage adjustments (e.g., decreased dosage of etomidate) may be required

More about Etomidate (monograph) (Amidate)

Etomidate (monograph) Side Effects
Etomidate Prescribing Information
Drug images
Side effects
Breastfeeding Warnings
Drug class: Drugs

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