Which statement about dosing midazolam in elderly patients is most accurate?

• A. Dosing does not need adjustment
• B. Sedation onset is slower but duration is unchanged
• C. It is safer with no respiratory risk
• D. Sedation duration may be prolonged due to reduced metabolism and increased sensitivity

Answer: (D)

In elderly patients, the duration of sedation from midazolam tends to be longer because both pharmacokinetic and pharmacodynamic changes occur with aging. Liver metabolism slows due to reduced hepatic blood flow and enzyme activity, and clearance of metabolites can be diminished, so the drug stays in the system longer. At the same time, older adults are more sensitive to central nervous system depressants, so even small doses can produce stronger and longer sleepiness, drowsiness, or device-dependence effects. This combination means that a dose that might be brief in a younger patient can cause extended sedation in an older one, with a higher risk of respiratory depression and delirium. Therefore, dosing must be started low and titrated slowly with careful respiratory and mental-status monitoring, and benzodiazepines should be used with caution or avoided in patients with multiple depressants or frailty.