Search for a therapeutic range for serum zuclopenthixol concentrations in schizophrenic patients.
1994
The aim of our study was to find a therapeutic range for the serum concentration of zuclopenthixol (S-Zu) in chronic schizophrenic patients. S-Zu was measured in 17 patients and dosage reduction was suggested by the laboratory if S-Zu exceeded 15 nmol/L. The clinical symptoms and side effects were evaluated blindly using the Brief Psychiatric Rating Scale (BPRS) and the UKU rating scale, respectively. S-Zu and ratings were repeated 6, 12, and 24 weeks after the final dosage adjustments. In 7 of 10 patients with S-Zu >15 nmol/L the dosage was reduced by 20-67%. After dosage reduction the S-Zu was below 15 nmol/L in 10 of the 17 patients. The mean BPRS score and the side effects, evaluated by the UKU scale, were reduced in patients in whom the dosage was reduced
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