Schizophrenia is a severe mental illness with a lifetime morbidity risk close to 1 %, involving both genetic and environmental risk factors. Prospective studies have shown that heavy use of cannabis in adolescence moderately increases the risk of developing schizophrenia. Many data have also suggested that the co-occurrence of cannabis abuse in patients with schizophrenia has a deleterious impact on the clinical outcome of schizophrenia. Cannabis abuse by schizophrenic patients is a significant public health problem for which there is no empirically validated treatment. We are presently studying the efficiency of motivational therapy on cannabis consumption in patients with schizophrenia.
Schizophrenia is a severe mental illness with a lifetime morbidity risk close to 1 %, involving both genetic and environmental risk factors. Prospective studies have shown that heavy use of cannabis in adolescence moderately increases the risk of developing schizophrenia. Many data have also suggested that the co-occurrence of cannabis abuse in patients with schizophrenia has a deleterious impact on the clinical outcome of schizophrenia. Cannabis abuse by schizophrenic patients is a significant public health problem for which there is no empirically validated treatment. We are presently studying the efficiency of motivational therapy on cannabis consumption in patients with schizophrenia. 330 patients with schizophrenia and cannabis abuse or dependence (according to DSM-IV criteria) are randomly assigned to 4 motivational interview during one month or usual intensive treatment. Treatment is conducted in outpatient which are evaluated at the inclusion and at 6 month with Time-Line Follow Bach for the consumption, PANSS score, number of relapse…). A outcome measure was urinalysis results providing an objective measure of cannabis use throughout the six month of the trial.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
97
One hour of motivational therapy each weak during 4 weeks
Patients received at least six hour of usual therapy, as in the experimental group
Service de psychiatrie (Pr Adès)
Colombes, France
Cannabis consumption evaluated by the Time-Line Follow Back at 6 months with mean percentage of abstinent day
Time frame: inclusion, 3 month, 6 month, 12 month
PANSS, GAF, number of DSM-IV criteria of cannabis dependence, May scale for treatment response, SF-12, la URICA, number of hospitalisation, mean number of joints per week, D9THC urinanalysis at 6M and cannabis consumption evaluated by the TLFB at 6M
PANSS : global, positive, negative, general scores
Time frame: inclusion, 3 month, 6 month, 12 month. Only inclusion and 6 month for urianalysis
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