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Vigabatrin for tuberous sclerosis complex.

Brain & Development 2001 November
Vigabatrin (VGB) was found to be an effective anti-epileptic drug to reduce infantile spasms in about 50% of patients and it has been found most effective in infantile spasms due to tuberous sclerosis (TSC) in which up to 95% of infants had complete cessation of their spasms. VGB was synthesized to enhance inhibitory gamma-aminobutyric acidergic (GABAergic) transmission by elevating GABA levels via irreversible inhibition of GABA transaminase. The mechanism underlying the particular efficacy of VGB in TSC is still unknown. However, its efficacy suggests that epileptogenesis in TSC may be related to an impairment of GABAergic transmission. VGB should be considered as the first line monotheraphy for the treatment of infantile spasms in infants with confirmed diagnosis of TSC. The efficacy of VGB treatment can be assessed in less than 10 days, but usually a few days treatment with a dose of about 100 mg/kg/day stops infantile spasms. The cessation of the spasms is associated with a marked improvement of behaviour and mental development. Unfortunately, it has become clear that the use of VGB is associated with a late appearance of visual-field defects in up to 50% of patients. Currently the minimum duration and doses of VGB treatment that can produce side effects are unknown. The feasibility of using short treatment periods (2-3 months) should be investigated.

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