<p>Concomitant use with drugs that are combined P-gp and CYP3A4 inhibitors (ketoconazole, ritonavir, clarithromycin, erythromycin, fluconazole, diltiazem, verapamil, dronedarone) increases in Rivaroxaban exposure and pharmacodynamic effects (i.e., factor Xa inhibition and PT prolongation), that&rsquo;s why should be avoided. Co-administration of Rivaroxaban with a combined P-gp and strong CYP3A4 inducer (e.g., rifampicin, phenytoin, carbamazepine) decreases the efficacy of Rivaroxaban and also should be avoided. The concomitant use of other drugs like anti-platelet agents, heparin, fibrinolytic therapy, NSAIDs may cause an increased risk of bleeding.</p>