Silymarin was assessed for drug-drug interaction by permeability studies with Caco-2 cells, for cytochrome P450 induction with human primary hepatocytes and for cytochrome P450 inhibition with human liver microsomes. Studies with Caco-2 cells revealed no interference of silymarin with the permeability of nifedipine. Silymarin did not induce cytochromes P450 2C9 and 3A4 at concentrations of 0.
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