Flupenthixol Treatment for Cocaine Abusers with Schizophrenia: A Pilot Study

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Abstract
Cocaine use is common among individuals with schizophrenia and schizoaffective illness, with a prevalence ranging from 15-60% of patient samples. It is hypothesized that some schizophrenic cocaine abusers may use cocaine as an attempt to improve anhedonic symptoms or combat neuroleptic side-effects. Flupenthixol (FLX) has the distinct advantage of being both a neuroleptic medication and a potential treatment for cocaine abuse. We evaluated the efficacy of FLX in this dually diagnosed population in an open pilot study consisting of a 4-week inpatient phase and a 6-week outpatient phase. Eight individuals were initially cross-tapered off their neuroleptic medication and were given FLX in a dose of 40 mg of the decanoate every 2 weeks. Psychiatric symptomatology was assessed weekly, using the Positive and Negative Symptom Scale (PANSS) and the Beck Depression Inventory (BDI). Medication side-effects were monitored weekly, using the Simpson Neurological Rating Scale and the Abnormal Involuntary Movement Scale (AIMS). Substantial improvement in psychiatric symptomatology was noted when preadmission scores were compared to scores obtained during the last week of study enrollment. On the PANSS, positive symptom scores and negative symptom scores decreased by 31% and 29%, respectively. Similarly, BDI scores decreased by 57%. Comparing preadmission urine results to those for the last 6 weeks of enrollment in the study showed that cocaine-positive urines decreased by 28%, although most of the patients had a reduction of >75%. Missed clinic visits decreased by 26%. Thus, FLX was well-tolerated by schizophrenic cocaine abusers, suggesting that FLX may be useful for the treatment of this dually diagnosed population.