DRUG INTERACTIONS
Effect of Strong CYP3A4 Inducers on Regorafenib
Co-administration of a strong CYP3A4 inducer (rifampin) with a single 160 mg dose of Stivarga decreased the mean exposure of regorafenib, increased the mean exposure of the active metabolite M-5, and resulted in no change in the mean exposure of the active metabolite M-2. Avoid concomitant use of strong CYP3A4 inducers (e.g. rifampin, phenytoin, carbamazepine, phenobarbital, and St. John's Wort) [see Clinical Pharmacology ].
Effect of Strong CYP3A4 Inhibitors on Regorafenib
Co-administration of a strong CYP3A4 inhibitor (ketoconazole) with a single 160 mg dose of Stivarga increased the mean exposure of regorafenib and decreased the mean exposure of the active metabolites M-2 and M-5. Avoid concomitant use of strong inhibitors of CYP3A4 activity (e.g. clarithromycin, grapefruit juice, itraconazole, ketoconazole, posaconazole, telithromycin, and voriconazole) [see Clinical Pharmacology (12.3)
].
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OVERDOSAGE
The highest dose of Stivarga studied clinically is 220 mg per day. The most frequently observed adverse drug reactions at this dose were dermatological events, dysphonia, diarrhea, mucosal inflammation, dry mouth, decreased appetite, hypertension, and fatigue.
There is no specific antidote for Stivarga overdose. In the event of suspected overdose, interrupt Stivarga, institute supportive care, and observe until clinical stabilization.
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