Drug Application
Clinical effects of individualized administration of phenytoin sodium in epileptic children guided by TDM combined with CYP2C19 genotype
Zhou Jianhua, Dong Fengqi, Wu Ganbin, Liu Kelan
Published 2019-08-25
Cite as Chin J Pract Med, 2019,46(16): 98-101. DOI: 10.3760/cma.j.issn.1674-4756.2019.16.032
Abstract
ObjectiveTo investigate the clinical effects of therapeutic drug monitoring (TDM) combined with CYP2C19 genotype on individualized administration of phenytoin sodium in children with epilepsy.
MethodsPolymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was used to detect CYP2C19 genotype in 232 children with epilepsy who were treated in the Second Affiliated Hospital of Zhengzhou University from January 2016 to June 2017. Among them, 78 children only took phenytoin sodium for antiepileptic treatment, and they were divided into fast, moderate and slow metablic groups by CYP2C19 genotypes. In fast, moderate and slow metabolic groups, different doses of phenytoin sodium were given to each group to monitor the blood concentration of phenytoin sodium in children.
ResultsCYP2C19 gene polymorphism was found in 232 children. The incidences of six genotypes, * 1 /* 1, * 1 /* 2, * 1 /* 3, * 2 /* 2, * 2 /* 3 /* 3 were 39.7%, 41.8%, 6.5%, 9.5%, 2.1% and 0.4% respectively. There was no difference in steady-state blood drug concentration among fast, moderate and slow metabolic groups in 78 children treated with phenytoin sodium only (P>0.05). There was no significant difference in the incidence of adverse reactions among the three groups (P>0.05).
ConclusionsCYP2C19 has polymorphism in children who take phenytoin sodium for antiepileptic treatment. Clinicians can adjust the dosage of phenytoin sodium to realize the individualization of the application of phenytoin sodium.
Key words:
CYP2C19; Individualization; Gene polymorphism; Blood drug concentration monitoring; Phenytoin sodium
Contributor Information
Zhou Jianhua
Department of Pharmacy, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, China
Dong Fengqi
Wu Ganbin
Liu Kelan