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Obeticholic acid (OCA), a potent and selective farnesoid X receptor agonist, is indicated for the treatment of primary biliary cholangitis (PBC). We investigated the potential drug–drug interaction effect of OCA on metabolic CYP450 enzymes and drug transporters. Methods: Five phase 1 single-center, openlabel, fixed-sequence, inpatient studies were conducted in healthy adult subjects to evaluate the effect of oral daily doses of 10 or 25 mg OCA on single-dose plasma pharmacokinetics of specific probe substrates for enzymes CYP1A2 (caffeine, R-warfarin), CYP3A (midazolam, Rwarfarin), CYP2C9 (S-warfarin), CYP2D6 (dextromethorphan), CYP2C19 (omeprazole), and drug transporters, BCRP/OATP1B1/OATP1B3 (rosuvastatin), and P-gp (digoxin).
Following multiple doses of OCA 10mg QD, AUC and Cmax increased by 22% and 27% respectively. Following multiple doses of OCA 25mg QD, AUC and Cmax of rosuvastatin decreased by 30% and 26% respectively.
Per the investigators, the changes in systemic exposures to rosuvastatin were small thus no dose adjustment is needed when co-administering with OCA.
Edwards JE, Eliot L, Parkinson A, Karan S, MacConell L. Assessment of pharmacokinetic interactions between obeticholic acid and caffeine, midazolam, warfarin, dextromethorphan, omeprazole, rosuvastatin, and digoxin in phase 1 studies in healthy subjects. Advances In Therapy. 2017; 9: 2120-2138.