Midazolam

Ultra-short acting·Neurology - Sedatives & Hypnotics

Status epilepticus, procedural sedation/amnesia, severe palliative agitation

BENZOHypnovelS4TGA

Max Dose

Titrated

Half-life

1.5–2.5 h

Resp. Drop

CRITICAL

Amnesia

PROFOUND

Rapid Summary

Overview

Ultra-short acting, intensely potent benzodiazepine. Used almost exclusively for procedural sedation, acute seizure termination, and palliative end-of-life distress.

Maximum Dose

Titrated strictly to clinical effect (sedation or seizure cessation).

Clinical Focus

High risk of sudden respiratory arrest. Must never be pushed IV outside of a monitored resuscitation setting (ED/ICU/OT).

Bottom Line

Midazolam is the standard short-acting benzodiazepine for procedural sedation and acute seizures (buccal/IM), but causes potent respiratory depression especially when combined with opioids.

Formulation & Access

Brand Names

Hypnovel

Parenteral

Ampoules (5 mg/1 mL, 15 mg/3 mL) for IV, IM, SC, or Buccal administration.

Prescribing & PBS

Hospital supply / Palliative care PBS.

Indications & Use

Primary

TGA

Status epilepticus, procedural sedation/amnesia, severe palliative agitation.

Clinical Place

The fastest, strongest, shortest-acting benzo. The ultimate chemical restraint for immediate life threats.

Quick reference

Class & Role

Ultra-short acting — Ultra-short acting, intensely potent benzodiazepine.

Route / Formulation

Ampoules (5 mg/1 mL, 15 mg/3 mL) for IV, IM, SC, or Buccal administration. (Hypnovel)

Usual Dose & Max

IV or IM 5-10 mg STAT. OR Buccal 10 mg (Highly effective in pediatrics and community). Titrated strictly to clinical effect (sedation or seizure cessation).

Key Indication Doses

Status Epilepticus: IV or IM 5-10 mg STAT. OR Buccal 10 mg (Highly effective in pediatrics and community). Procedural Sedation: IV 1-2 mg slowly. Titrate to effect. (Requires dedicated airway practitioner). Palliative Agitation: SC 2.5-5 mg PRN or via 24h continuous syringe driver.

Best Uses

Midazolam is the standard short-acting benzodiazepine for procedural sedation and acute seizures (buccal/IM), but causes potent respiratory depression especially when combined with opioids.

Avoid / Cautions

Unmonitored environments without airway equipment.

Key Risks

Respiratory: Apnoea, profound respiratory depression, airway obstruction (loss of pharyngeal tone). Cardiovascular: Hypotension, vasodilation. Neurological: Profound anterograde amnesia (desired for procedures, dangerous otherwise), paradoxical agitation (especially in kids/elderly).

Key Interactions

Fentanyl / Morphine. The combination of Midazolam + Fentanyl is synergistic for procedural sedation but synergistic for fatal apnoea. Strong CYP3A4 inhibitors (Clarithromycin) massively prolong the coma.

Monitoring

Continuous SpO2, RR, and BP. Resuscitation equipment (bag-valve-mask, suction, Flumazenil) MUST be at the bedside.

Clinical Pearl

In an actively seizing patient, gaining IV access is nearly impossible and IM injections take 15 minutes to work. Drawing up the IV ampoule into a syringe and squirting it into the buccal space (between cheek and gum) provides rapid, massive absorption straight into the brain.

Access

Hypnovel

Brand: Hypnovel

Midazolam

Ultra-short acting·Neurology - Sedatives & Hypnotics

Status epilepticus, procedural sedation/amnesia, severe palliative agitation

BENZOHypnovelS4TGA

Max Dose

Titrated

Half-life

1.5–2.5 h

Resp. Drop

CRITICAL

Amnesia

PROFOUND

Rapid Summary

Overview

Ultra-short acting, intensely potent benzodiazepine. Used almost exclusively for procedural sedation, acute seizure termination, and palliative end-of-life distress.

Maximum Dose

Titrated strictly to clinical effect (sedation or seizure cessation).

Clinical Focus

High risk of sudden respiratory arrest. Must never be pushed IV outside of a monitored resuscitation setting (ED/ICU/OT).

Bottom Line

Midazolam is the standard short-acting benzodiazepine for procedural sedation and acute seizures (buccal/IM), but causes potent respiratory depression especially when combined with opioids.

Formulation & Access

Brand Names

Hypnovel

Parenteral

Ampoules (5 mg/1 mL, 15 mg/3 mL) for IV, IM, SC, or Buccal administration.

Prescribing & PBS

Hospital supply / Palliative care PBS.

Indications & Use

Primary

TGA

Status epilepticus, procedural sedation/amnesia, severe palliative agitation.

Clinical Place

The fastest, strongest, shortest-acting benzo. The ultimate chemical restraint for immediate life threats.

Quick reference

Class & Role

Ultra-short acting — Ultra-short acting, intensely potent benzodiazepine.

Route / Formulation

Ampoules (5 mg/1 mL, 15 mg/3 mL) for IV, IM, SC, or Buccal administration. (Hypnovel)

Usual Dose & Max

IV or IM 5-10 mg STAT. OR Buccal 10 mg (Highly effective in pediatrics and community). Titrated strictly to clinical effect (sedation or seizure cessation).

Key Indication Doses

Best Uses

Midazolam is the standard short-acting benzodiazepine for procedural sedation and acute seizures (buccal/IM), but causes potent respiratory depression especially when combined with opioids.

Avoid / Cautions

Unmonitored environments without airway equipment.

Key Risks

Key Interactions

Monitoring

Continuous SpO2, RR, and BP. Resuscitation equipment (bag-valve-mask, suction, Flumazenil) MUST be at the bedside.

Clinical Pearl

Access

Hypnovel

Brand: Hypnovel