“Results showed that isoniazid (plus pyridoxine) significantly elevated the mean (+/- S.E.M.) levels of gamma-aminobutyric acid, aspartate, asparagine, homocarnosine, ornithine, histidine, alpha-aminobutyric acid , isoleucine, leucine and alanine in CSF and the levels of beta-alanine in both CSF and plasma.”