Interactions

Drug-Drug

• Rifampin, corticosteroids, phenobarbital, and pentobarbital increase metabolism and may decrease effectiveness

• Cimetidine, cyclosporine, diltiazem, erythromycin, ketoconazole, and verapamil decrease metabolism and may increase effects

Drug-Natural Products
St. John's wort may increase metabolism and decrease effectiveness

Drug-Food
Absorption is increased by food

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