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Perampanel's forgiveness factor in a variable medication adherence paradigm in a rat model of chronic epilepsy. | LitMetric

Perampanel's forgiveness factor in a variable medication adherence paradigm in a rat model of chronic epilepsy.

J Transl Med

Center for Epilepsy Drug Discovery, Department of Pharmacy, School of Pharmacy, University of Washington, Health Sciences Building F563, 1959 NE Pacific Street, Box 357630, Seattle, WA, 98195-7630, USA.

Published: September 2023

AI Article Synopsis

Article Abstract

Background: Poor medication adherence contributes to increased morbidity and mortality in patients with epilepsy and may be under-addressed in clinical practice. Ethical concerns make it impossible to study the impact of medication nonadherence in clinical trials, but our previous work emphasizes the importance of using preclinical approaches to address these questions. With over 30 clinically available antiseizure medicines (ASM's), it remains an important question to understand the relationship between poor adherence and seizure incidence across mechanistically distinct ASM's, including the broad-spectrum ASM, perampanel (PER).

Methods: We formulated PER into chow pellets to deliver to rats in a 100% fully adherent or 50% variable nonadherent paradigm via our novel automated medication-in-food delivery system. Chronic oral dosing was initiated in male rats with chronic epilepsy while monitoring 24/7 for videoEEG evidence of seizures during a 4-week placebo baseline and 4-week treatment phase. PER concentrations were monitored in plasma at 1-week intervals and correlated with degree of seizure control. The relationship between missed doses and extended patterns of nonadherence were correlated with breakthrough seizures.

Results: Fully adherent rats demonstrated a median reduction in seizure frequency of 50%, whereas nonadherent rats had a median increase of 54%. Plasma concentrations of PER were stable over the 4-week treatment period in both fully adherent and nonadherent groups, with levels being twice as high in fully adherent animals. There was no correlation between a single missed dose or series of missed doses and the incidence of breakthrough seizures. However, those animals in the nonadherent group that received PER for every meal during a 24-h period had a reduced likelihood of seizure incidence.

Conclusions: If our preclinical data is supported in the clinic, PER's favorable pharmacokinetic profile in humans, combined with a lowered risk of breakthrough seizures suggests that it may provide a certain forgiveness factor if a dose is missed within a 24-h window.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10510183PMC
http://dx.doi.org/10.1186/s12967-023-04490-zDOI Listing

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