<p>Since Tacrolimus is metabolized mainly by CYP3A enzymes, drugs or substances known to inhibit these enzymes may increase Tacrolimus whole blood concentrations. Drugs known to induce CYP3A enzymes may decrease Tacrolimus whole blood concentrations. Dose adjustments may be needed along with frequent monitoring of Tacrolimus whole blood trough concentrations when Tacrolimus is administered with CYP3A inhibitors or inducers. In addition, patients should be monitored for adverse reactions including changes in renal function and QT prolongation.</p>