Therapeutic Drug Monitoring for Perampanel in Japanese Epilepsy Patients: Influence of Concomitant Antiepileptic Drugs.
Ther Drug Monit
; 39(4): 446-449, 2017 08.
Article
em En
| MEDLINE
| ID: mdl-28703720
ABSTRACT
BACKGROUND:
Perampanel is a new antiepileptic drug (AED) that acts as a noncompetitive α-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA) receptor antagonist and is mainly metabolized by cytochrome P450 (CYP) 3A4. This study evaluated the influence of concomitant AEDs on the serum concentration profile of perampanel.METHODS:
A total of 215 serum samples obtained from 76 patients aged 12 years or older were analyzed for routine therapeutic drug monitoring, and the concentration-to-dose ratio (CD ratio) of perampanel was compared among patients on various AED regimens.RESULTS:
In patients not taking concomitant enzyme-inducing AEDs, the mean CD ratio was 3963 ng·mL·mg·kg (range 1793-13,299). By contrast, the mean CD ratio was lower in patients using enzyme-inducing AEDs [1760 (range 892-3090), 2256 (range 700-4703), and 1120 (range 473-1853) ng·mL·mg·kg in patients taking phenytoin, phenobarbital, and carbamazepine, respectively], and carbamazepine had a significantly greater reduction in the CD ratio compared with phenytoin or phenobarbital (P < 0.001). Twenty-one patients responded with ≥50% reduction of seizure frequency from baseline, and their mean serum perampanel concentration was 450 ng/mL (range 85-1500).CONCLUSIONS:
There is a large interindividual variation in CD ratio of perampanel because its metabolism is highly susceptible to interactions with enzyme-inducing AEDs. Therapeutic drug monitoring could be clinically useful for determining the influence of AED CYP3A4 inducers on perampanel concentrations.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Piridonas
/
Monitoramento de Medicamentos
/
Epilepsia
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Anticonvulsivantes
Tipo de estudo:
Observational_studies
/
Risk_factors_studies
Limite:
Adolescent
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Adult
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Aged
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Child
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Female
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Humans
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Male
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Middle aged
País como assunto:
Asia
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article