Drug Interaction Report

MONITOR: Coadministration with pitolisant may reduce plasma concentrations of substrates of CYP450 2C, P-glycoprotein (P-gp), and uridine diphosphate glucuronosyltransferases (UGTs). Based on in vitro data, pitolisant and its main metabolites may induce CYP450 2C, P-gp, and UGTs. Clinical data are not available.

MANAGEMENT: Caution is recommended if pitolisant is used in combination with substrates of CYP450 2C, P-gp, and/or UGTs. Clinical and laboratory monitoring may be appropriate for some drugs whenever pitolisant is added to or withdrawn from therapy.

Food enhances the oral absorption and bioavailability of tenofovir, the active entity of tenofovir disoproxil fumarate. According to the product labeling, administration of the drug following a high-fat meal increased the mean peak plasma concentration (Cmax) and area under the concentration-time curve (AUC) of tenofovir by approximately 14% and 40%, respectively, compared to administration in the fasting state. However, administration with a light meal did not significantly affect the pharmacokinetics of tenofovir compared to administration in the fasting state. Food delays the time to reach tenofovir Cmax by approximately 1 hour. Tenofovir disoproxil fumarate may be administered without regard to meals.