Drug Interaction Report

Theoretically, coadministration with inducers of CYP450 3A4 and/or P-glycoprotein (P-gp) may decrease the plasma concentrations of apixaban, which is a substrate of both the isoenzyme and the efflux transporter. When apixaban was coadministered with 600 mg/day of rifampin, a dual P-gp and potent CYP450 3A4 inducer, mean apixaban peak plasma concentration (Cmax) and systemic exposure (AUC) decreased by 42% and 54%, respectively. No data are available for use with other, less potent CYP450 3A4 and/or P-gp inducers.

MONITOR: Coadministration of two or more sympathomimetic agents may increase the risk of adverse effects such as nervousness, irritability, and increased heart rate. Central nervous system (CNS) stimulants, particularly amphetamines, can potentiate the adrenergic response to vasopressors and other sympathomimetic agents. Additive increases in blood pressure and heart rate may occur due to enhanced peripheral sympathetic activity.

MANAGEMENT: Caution is advised if two or more sympathomimetic agents are coadministered. Pulse and blood pressure should be closely monitored.