Benzodiazepine Conversion and Sedation

Pharmacological Properties

Midazolam is a water-soluble, short-acting benzodiazepine that is 1.5-3.5 times more potent than diazepam with a rapid onset of action (1-2 minutes) and shorter duration of effect (15-80 minutes) 1
Midazolam has a faster onset (1-2 minutes IV) with peak effect at 3-4 minutes, and a shorter duration (15-80 minutes) requiring more frequent dosing 1
Midazolam has more rapid clearance, especially in younger patients with normal hepatic function 1

Elderly patients and those with hepatic or renal impairment require dose reductions for both medications 1
Patients on concomitant CNS depressants may require lower doses of either medication due to synergistic effects 1
When either medication is combined with opioids, dose reductions are necessary due to synergistic respiratory depression 1

Both medications can cause respiratory depression, with midazolam potentially causing apnea up to 30 minutes after administration 1
Flumazenil can be used as an antidote for benzodiazepine-induced respiratory depression, but its duration of action (approximately 1 hour) may be shorter than the benzodiazepine effect, requiring monitoring for re-sedation 1
When using either medication for acute agitation in the emergency department, both are considered effective as monotherapy 2