Abstract
During a double-blind placebo controlled trial, γ-aminobutyric acid (GABA) was measured in cerebrospinal fluid (CSF) and plasma obtained from patients with Huntington's Disease prior to the start of the trial, at the end of the placebo period and following treatment with isoniazid. The results showed that the GABA concentrations in CSF tripled following treatment with isoniazid although no significant change occurred in plasma GABA levels. This finding in humans indirectly confirms reports of a similar increase of brain GABA content in experimental animals following isoniazid treatment and provides additional evidence that CSF GABA measurements reflect brain GABA activity.
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