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20 - Antiepileptic drugs in non-epileptic health conditions: possible interactions

from Part IV - Drug interactions in specific patient populations and special conditions

Published online by Cambridge University Press:  07 September 2009

Jerzy Majkowski
Affiliation:
Center for Epilepsy Diagnosis and Treatment Foundation of Epileptology, Warsaw, Poland
Jerzy Majkowski
Affiliation:
Foundation of Epileptology, Warsaw
Blaise F. D. Bourgeois
Affiliation:
Harvard University, Massachusetts
Philip N. Patsalos
Affiliation:
Institute of Neurology, London
Richard H. Mattson
Affiliation:
Yale University, Connecticut
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Summary

Introduction: AEDs in non-epileptic conditions

Ever since they first appeared, antiepileptic drugs (AEDs) have not infrequently been used to treat patients with conditions other than epilepsy. Some AEDs, e.g. phenytoin (PHT), carbamazepine (CBZ) and valproic acid (VPA), have for long been indicated in a number of neurological and psychiatric disorders. The same is true for some of the new generation AEDs, such as gabapentin (GBP), lamotrigine (LTG), levetiracetam (LEV), oxcarbazepine (O-CBZ), tiagabine (TGB), topiramate (TPM) and pregabalin (PGB). It seems that newer AEDs – compared with the older ones – may be at least equally effective in non-epileptic disorders, but with fewer adverse events, and with minimal or no drug interactions. However, it should be stressed that evidence-based medicine varies broadly as far as the efficacy of particular drugs in given disorders or health conditions is concerned. Moreover, the number of reports and trials, and the extent of usage of these drugs vary greatly.

Epilepsy with its prevalence of about 1% is one of the most common neurological conditions. However, because AEDs have been used in several other neurological and psychiatric conditions with a higher prevalence than epilepsy, altogether they present a large market for AED usage. For example, in the United States LTG, TPM and GBP use – in terms of pharmaceutical market (IMS, 2000, 2001, 2002) – is greater for non-epileptic disorders than for epilepsy; moreover, there is an increasing trend for use of TPM and LTG from 2000 to 2002 (Table 20.1).

Type
Chapter
Information
Antiepileptic Drugs
Combination Therapy and Interactions
, pp. 369 - 391
Publisher: Cambridge University Press
Print publication year: 2005

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