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Interactions of Phenobarbital and Phenytoin with Carbamazepine and Its Metabolites' Concentrations, Concentration Ratios, and Level/Dose Ratios in Epileptic Children
Author(s) -
Liu Hua,
Delgado Mauricio R.
Publication year - 1995
Publication title -
epilepsia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.687
H-Index - 191
eISSN - 1528-1167
pISSN - 0013-9580
DOI - 10.1111/j.1528-1157.1995.tb00992.x
Subject(s) - carbamazepine , phenytoin , chemistry , phenobarbital , pharmacology , anticonvulsant , metabolite , drug interaction , pharmacokinetics , epilepsy , medicine , biochemistry , psychiatry
Summary: The effects of phenytoin (PHT) or phenobarbital (PB) comedication on the concentrations, concentration ratios, and level/dose ratios of carbamazepine (CBZ) and its metabolites were investigated. The hetero‐induction effects of CBZ metabolism by PHT or PB were clearly demonstrated. Serum CBZ level/dose ratios in patients with CBZ polytherapy were decreased while CBZ‐ l0,11‐epoxide (CBZ‐E) and trans ‐l0,11‐dihydroxy‐10, 1‐dihydro‐CBZ (CBZ‐H) concentrations were increased as compared with those of patients receiving CBZ alone. The concentration ratios of CBZ‐H/CBZ and CBZ‐E/ CBZ were also greater in patients receiving CBZ +PHT or CBZ+PB than in patients receiving CBZ alone. In addition, positive correlations between serum PHT concentration and CBZ‐H/CBZ or CBZ‐E/CBZ concentration ratios were observed. There were no significant differences in CBZ‐H/CBZ‐E concentration ratios, the free fractions of CBZ and its metabolites, and CBZ‐E or CBZ‐H 1eveYdose ratios among the three groups of patients. Because this approach investigates the in vivo relation between the substrates and products of the enzymes involved in CBZ biotransformation, more detailed information about the drug interactions was obtained. The results suggest that the PHT has a potent induction effect on CBZ epoxidase, whereas PB is a moderate inducer.