“…As a treatment for ASD, such medications should be combined with patient/family education and/or psychosocial intervention [3]; however, the mutism has often failed to show improvement with SSRI treatment, and particularly in Japan, the psychosocial interventions for patients with ASD cannot be conducted due to healthcare facilities limitations. In previous studies [3][4][5][6][7], alterations of neurotransmitters have been demonstrated in ASD patients including lower gamma-aminobutyric acid (GABA) levels, higher glutamate levels, hyperserotonemia, and increased dopamine turnover. In particular, social disabilities in ASD patients were revealed to be related to abnormalities in both the glutamate [3,7,8] and dopamine systems [4][5][6][7].…”