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We conducted an observation of 83 children with therapy-resistant formsof epilepsy between the ages of 11 months and 18 years. The presenceof CYP2C9, CYP2C19 and CYP3A4 gene polymorphisms was detected in 60 of the examined patients, that is, 72.29 % of them, 33 patients (39.76 %) had CYP2C19 gene polymorphisms, CYP2C9 gene polymorphisms had 17 (20.48 %) children, and 10 (12.05 %) of them had CYP3A4 gene polymorphisms. The frequency of CYP2C19*2 and CYP3A4*1B polymorphisms was signifi cantly higher than in the Ukrainian and other European populations, no statistical data signifi - cance of differences in the frequency of CYP2C9 gene polymorphisms compared with the Ukrainian population was found. CYP2C19 gene polymorphisms aresignifi cantly more frequently recorded by us compared to the results obtained by researchers in Russia and Turkey in closely related studies.It is shown that children with cytochrome P450 gene polymorphisms arerecommended: more frequent clinical, instrumental, and laboratory monitoring of patients to prevent side eff ects of therapy; monitoring (not a one-time study) of AED concentration in blood plasma. The necessity of conduction of pharmacogenetic research at the stage of debut of epilepsy in the case of suspicion of treatment-resistant form of the disease and in the case of ineffi - ciency or severe side eff ects of the fi rst assigned AED was demonstrated.Key words: children, treatment, resistant epilepsy, cytochrome P450, gene polymorphism.

Possibilities of optimizing approaches to the treatment of resistant epilepsy in children using pharmacogenetic studies data