Abstract
1. 1. The study aimed to search for the effect of clozapine on the levels of the main metabolites of dopamine homovanillic acid (HVA), serotonin 5-hydroxyindoleacetic acid (5-HIAA) and norepinephrine 3-methoxy-4-hydroxyphenylglycol (MHPG) in urine as well as on plasma levels of HVA, 5-HIAA, prolactin (PRL) and cortisol. 2. 2. Seventeen male patients diagnosed as suffering from DSM-IIIR schizophrenia completed the study. 3. 3. The patients were switched from classical antipsychotics to clozapine. After six weeks treatment with clozapine the severity of psychopathology (total BPRS score) decreased significantly (p=0.00004). pHVA and -5-HIAA did not change significantly. uMHPG increased significantly (p=0.017). Both PRL and cortisol levels decreased significantly (p=0.0002, p=0.032 respectively). Patients with high HVA levels in both plasma and urine at baseline had a lower BPRS score at the end of treatment period (p=0.0001, p=0.049 respectively).
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