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The central effects of other CNS depressants, including alcohol, may be enhanced by Quetiapine. Quetiapine may antagonize the actions of dopaminergics such as levodopa.
CYP3A4 is the main isoenzyme responsible for cytochrome P450 mediated metabolism of Quetiapine and caution is advised when Quetiapine is used with potent inhibitors of CYP3A4 such as erythromycin, fluconazole, itraconazole, and ketoconazole; lower doses of quetiapine should be used when given with such inhibitors. Conversely, enzyme inducers such as carbamazepine and phenytoin may decrease the plasma concentrations of quetiapine, and higher doses of quetiapine may be necessary. Thioridazine has also been reported to increase the clearance of quetiapine.
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