Overview
Midazolam is a short-acting benzodiazepine used primarily for the treatment of status epilepticus in adults. It acts as a central nervous system depressant by enhancing GABA activity, producing sedative, anxiolytic, and anticonvulsant effects. The injection formulation is administered intramuscularly via autoinjector for rapid seizure control in emergency settings.
Mechanism of Action
Midazolam is a benzodiazepine that potentiates the effects of gamma-aminobutyric acid (GABA), the major inhibitory neurotransmitter in the central nervous system. It binds to specific sites on GABA-A receptors, increasing chloride ion channel opening frequency, resulting in neuronal hyperpolarization and reduced neuronal excitability.
Indications
- Treatment of status epilepticus in adults
Common Doses
- 10 mg
Dosage
Recommended dose is a single 10 mg intramuscular injection administered in the mid-outer thigh (vastus lateralis muscle) using a prefilled autoinjector. Should be administered by trained personnel with skills in airway management and status epilepticus treatment.
Contraindications
- Known hypersensitivity to midazolam
- Narrow-angle glaucoma
Side Effects
- Respiratory depression
- Hypotension
- Headache
- Injection site pain
- Agitation
- Involuntary movements
- Combativeness
- Oxygen desaturation
- Apnea
- Cardiac arrest
- Local injection site reactions (induration, redness, muscle stiffness)
Interactions
- Opioids: Increased risk of profound sedation and respiratory depression
- Other CNS depressants (alcohol, barbiturates): Enhanced sedative effects and respiratory depression
- Cytochrome P450-3A4 inhibitors (cimetidine, erythromycin, ketoconazole): Prolonged sedation due to decreased midazolam clearance
Counseling Points
- For emergency use only in status epilepticus
- Administer as single dose in mid-outer thigh
- Can inject through clothing
- Seek immediate medical attention after administration
- Do not operate machinery until effects have subsided
- Risk of dependence with frequent use
- Avoid alcohol and other CNS depressants