May enhance effect of certain antihypertensive medicinal products. Concomitant use w/ alcohol or other CNS medicinal products w/ overlapping adverse reactions eg, sedation; medicinal products known to cause QT prolongation or electrolyte imbalance. Increased AUC w/ potent CYP2D6 inhibitors eg, quinidine, fluoxetine, & paroxetine. Increased AUC & C
max w/ potent CYP3A4 inhibitors eg, ketoconazole, itraconazole & HIV PIs. Modest increases in plasma conc w/ weak inhibitors of CYP3A4 (eg, diltiazem) or CYP2D6 (eg, escitalopram). Decreased AUC & C
max w/ CYP3A4 inducers eg, carbamazepine, rifampicin, rifabutin, phenytoin, phenobarb, primidone, efavirenz, nevirapine, & St. John's wort. Cases of serotonin syndrome w/ SSRI/SNRI or medicinal products known to increase conc.