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Serum level monitoring of thiothixene in schizophrenia: acute single- dose levels at fixed doses

Published Online:https://doi.org/10.1176/ajp.139.2.174

After establishing a strong correlation between steady-state thiothixene levels and levels drawn 2.5 hours after a 20-mg test dose, the authors examined the correlation between clinical improvement and serum levels drawn 2.5 hours after a single 20-mg test dose of thiothixene. For 30 male schizophrenic inpatients, improvement on the Brief Psychiatric Rating Scale was significantly correlated with the single test-dose levels. Serum levels were also positively correlated with age, which may explain the tendency of elderly patients to require lower neuroleptic doses and to exhibit a higher incidence of side effects. The results suggest that acute single-dose levels may be useful in predicting clinical response to thiothixene.

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