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The influence of vitamins with antioxidant properties (vitamins A, E, C), B vitamins (B1, B2, B6) and vitamin-like substances (coenzyme Q10, taurine and L-carnitine) on the enzymes of the first phase of xenobiotic metabolism - cytochromes P450 3A4 and P450 2C9 has been studied. The experiments with informed volunteers have shown that B vitamins can shorten the duration of nonsteroidal anti-inflammatory drug diclofenac therapy and reduce the daily need for it. The positive effect of B vitamins in reducing the pain syndrome, shortening the duration of therapy and reducing the need for daily intake of diclofenac. Pharmacodynamic and pharmacokinetic data have been confirmed by electrochemical tests of electrocatalytic activity of cytochrome P450 3A4 (CYP3A4). Electrochemical approach to the study of catalytic activity of cytochrome P450 and the impact of vitamins and natural compounds on electrocatalysis is an accurate and effective touch-sensitive method allowing to use low concentrations of protein at an electrode (10-15 mol/electrode), to conduct the analysis without using protein pairs (cytochrome B5, NADPH-dependent reductase) and to identify the interaction of drugs in preclinical studies. When comparing the influence of B vitamins (B1, B2, B6) in the same concentration (300 μM) according to the electrochemical analysis, riboflavin (vitamin B2) is most effectively inhibits the interaction of diclofenac with cytochrome P450 3A4. Vitamin-like substance taurine with antioxidant properties and antioxidant vitamins stimulated electrochemical reduction of cytochromes P450 3A4 and P450 2C9. The obtained data confirm that it is possible that the influence of vitamins on cytochromes P450 3A4 (CYP3A4) и P450 2C9 (CYP2C9) allows to regulate pharmacokinetic parameters and the pharmacodynamic effect intensity.