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  • Title: Therapeutic and pharmacokinetic effects of increasing phenytoin in chronic epileptics on multiple drug therapy.
    Author: Lambie DG, Johnson RH, Nanda RN, Shakir RA.
    Journal: Lancet; 1976 Aug 21; 2(7982):386-9. PubMed ID: 73851.
    Abstract:
    Twenty chronic epileptics receiving phenytoin and either phenobarbitone or primidone have been studied. All patients had frequent seizures and had serum concentrations of phenytoin below 410 mumol/1. Phenytoin dosage was increased to study the effect on the frequency of seizures and the serum concentrations of phenytoin and phenobarbitone. There was no effect on minor seizures but in ten out of sixteen patients major seizures were abolished or reduced. Serum concentrations of phenobarbitone rose as the phenytoin dose was increased. This may cause deviations from the expected relationship between dose and serum concentrations of phenytoin; this would explain deficiencies which were found in a nomogram for predicting the therapeutic dose of phenytoin.
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