[Determination of the optimal dose of bromazepam in the elderly]. The aim of our study was to determine in patients over 70 years, the optimal dose of Bromazepam. Seven patients were administered a unique dose of Bromazepam (3 mg), then repeated doses (1.5 mg) every 12 hours for 9 days. Cmax was 42.5 +/- 12 ng/ml in Tmax ranged from 2 to 12 hours after the first dose-concentrations of Bromazepam at steady-state were between 79 and 157 ng/ml. Half life was 30.5 +/- 14.7 hrs for the unique and the repeated doses. Sleeping was noted for concentrations over 40 ng/ml. The dose of 1.5 mg bid is recommended in old patients.