In vitro studies of azacitidine with cultured human hepatocytes indicate that at concentrations of 1.0 µM to 100 µM (i. e. up to approximately 30-fold higher than clinically achievable concentrations), azacitidine does not induce cytochrome P450 isoenzymes (CYP) 1A2, 2C19, or 3A4 or 3A5.