Cimetidine: Cimetidine significantly impaired the clearance of alprazolam and prolonged its half-life. In healthy volunteers, a single 1 mg dose of alprazolam was administered with and without concurrent administration of cimetidine (300 mg) every 6 hours. Cimetidine significantly reduced total metabolic clearance (1.05 versus 1.66 mL/min/kg) and significantly prolonged elimination half-life (16.6 hours versus 12.4 hours). Similar results were observed during repeated administration of both drugs
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