Vigabatrin is an effective drug for the treatment of epilepsy and has been available to clinicians for several years. However, long term experience with the drug has identified a disturbing and relatively common adverse event: visual field defects occur in approximately one third of patients treated with vigabatrin. The 23rd International Epilepsy Congress [Prague, Czech Republic; September 1999] provided an opportunity for clinicians to talk about the visual field defect issue in detail and discuss whether the benefits of vigabatrin therapy still outweigh the risks.
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