Preliminary study of the association between the elimination parameters of phenytoin and phenobarbital

Methaneethorn, Janthima; Panomvana, Duangchit; Vachirayonstien, Thaveechai

doi:10.1515/dmpt-2017-0017

Drug Metabolism and Personalized Therapy

2017

DOI: 10.1515/dmpt-2017-0017

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Preliminary study of the association between the elimination parameters of phenytoin and phenobarbital

Janthima Methaneethorn

Duangchit Panomvana

Thaveechai Vachirayonstien

Abstract: Regression equations were established for estimating Vmax from CLPB, and vice versa in patients treated with combination of phenytoin and phenobarbital. These proposed equations can be of use in aiding individualized drug therapy.

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2022

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Cited by 2 publications

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The effect of nonadherence on phenobarbital concentrations and recommendations on the replacement dose using Monte Carlo simulation

Methaneethorn

2022

Drug Metabolism and Personalized Therapy

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Objectives To determine the impacts of missed phenobarbital (PB) doses on its pharmacokinetics and to investigate the appropriate replacement dosing scheme for various PB missed dose scenarios. Methods Monte Carlo simulations were performed using parameters from the selected population pharmacokinetic study. The impacts of missed PB dose and the proper replacement dosing scheme were assessed based on the percent deviation of simulated concentrations outside the reference range from the full adherence scenario. Results The impact of missed PB dose on its concentrations depended on the daily dose. The replacement with a respective regular dose and one and a half regular dose was appropriate for the one and two missed doses scenarios for patients receiving PB monotherapy. For patients receiving PB with valproic acid or phenytoin, the same replacement scheme was still appropriate. The results also indicated that weight did not influence the proper replacement dosing scheme. Conclusions The impacts of missed PB doses on its pharmacokinetics were identified and the proper replacement dosing schemes for different missed dose scenarios were proposed. These schemes should be implemented based on the clinician’s justification of the patient’s seizure control.

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The effect of nonadherence on phenobarbital concentrations and recommendations on the replacement dose using Monte Carlo simulation

Methaneethorn

2022

Drug Metabolism and Personalized Therapy

View full text Add to dashboard Cite

show abstract

The effect of nonadherence on phenobarbital concentrations and recommendations on the replacement dose using Monte Carlo simulation

Methaneethorn

2022

Drug Metabolism and Personalized Therapy

View full text Add to dashboard Cite

show abstract

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Preliminary study of the association between the elimination parameters of phenytoin and phenobarbital

Abstract: Regression equations were established for estimating Vmax from CLPB, and vice versa in patients treated with combination of phenytoin and phenobarbital. These proposed equations can be of use in aiding individualized drug therapy.

Cited by 2 publications

References 23 publications

The effect of nonadherence on phenobarbital concentrations and recommendations on the replacement dose using Monte Carlo simulation

The effect of nonadherence on phenobarbital concentrations and recommendations on the replacement dose using Monte Carlo simulation

The effect of nonadherence on phenobarbital concentrations and recommendations on the replacement dose using Monte Carlo simulation

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