Enhanced sedation or resp & CV depression w/ alcohol, antidepressants, sedative antihistamines, antipsychotics, general anesth, other hypnotics or sedatives & opioid analgesics. Enhanced sedative effect w/ cisapride. May increase conc & enhance activity w/ hepatic enzyme inhibitors (particularly CYP450 34A). Impairment of clearance, prolonged elimination t
1/2 & enhanced clinical effects w/ HIV PIs (eg, ritonavir). Increased digoxin conc. Increased steady state plasma conc of imipramine & desipramine. Azole antifungals; nefazodone, fluvoxamine & cimetidine, fluoxetine, propoxyphene, OCs, diltiazem, macrolides (eg, erythromycin & troleandomycin).