Drug interactions with Xeljanz (tofacitinib) - CP3A4 (ketoconazole) & CYP2C19 Inhibitors (fluconazole) may increase TOFA exposure; CYP3A4 Inducers (rifampin) may reduce TOFA; do not combine with other immunosuppressants (AZA, CsA, tacrolimus) https://t.co/yrs7RBmn2P