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  • Title: Gabapentin in the management of convulsive disorders.
    Author: McLean MJ.
    Journal: Epilepsia; 1999; 40 Suppl 6():S39-50; discussion S73-4. PubMed ID: 10530682.
    Abstract:
    Gabapentin, in clinical use since 1993, is indicated as an adjunctive antiepileptic drug (AED) for treatment of complex partial seizures, with or without secondary generalization, in patients over 12 years of age. Although several cellular actions have been described in the literature, the molecular mechanism(s) of action responsible for the anticonvulsant effect of gabapentin has not been conclusively determined. It is likely that gabapentin has multiple concentration-dependent actions that combine in a unique manner to produce antiepileptic efficacy. The pharmacokinetic properties of this water-soluble, amino-acid AED are generally favorable. Absorption appears to be dependent on transport by the L-system amino acid transporter. Elimination of unmetabolized drug occurs by the renal route. Although its therapeutic range is not well characterized, gabapentin has a broad therapeutic index. This implies that a wide range of doses can be used, based on individual patient needs, without significant limitation due to dose-dependent side effects. Gabapentin has few drug-drug interactions, none of which is clinically limiting. Several studies have demonstrated the long-term efficacy of gabapentin with no systematic evidence of tachyphylaxis. In addition, there is increasing evidence to support the use of gabapentin as monotherapy. Gabapentin is safe and is generally well tolerated. To date, nearly 3 million patients have been treated in studies and in open use without causal relationship to a specific life-threatening organ toxicity. Seizure control superior to that observed in well-controlled trials has been reported at higher doses used in clinical practice and in studies. Therefore, gabapentin dosing must be optimized on an individual basis to achieve an adequate trial of the drug and obtain the best seizure control.
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