Eligibility Criteria:
Inclusion Criteria:
\- Diagnosis of schizophrenia (ICD-10)
Other criteria related to the diagnosis verified during the selection visit:
* The score for the PANSS negative symptoms subscale ≥ 21,
* Severity of individual symptoms in the PANSS positive symptoms subscale may not exceed 3 points.
Exclusion Criteria:
General
* lack of written informed consent,
* risk of noncompliance during the study period,
* patients who can not be assessed throughout the study period (eg. due to travel or vacations),
* pregnancy or breastfeeding,
* women of childbearing potential not using effective contraception (ie. birth control pill, surgical sterilization, hormonal contraceptive injection, IUD, contraceptive implant, patch, or condoms),
* participation in another clinical study, currently or within 3 months before the visit of a selection panel
* patients previously subjected to selection for this study.
Medical and Therapeutic Criteria Associated with schizophrenia
* patients in acute psychosis, severe symptoms of productive,
* patients taking clozapine,
* declaring suicidal tendencies, history of committing suicide in the past year.
Associated with other psychiatric disorders
* patients currently meeting criteria for ICD-10 diagnosis of mental disorder other than schizophrenia (in the last 6 months before the visit of a selection), confirmed by the MINI questionnaire
* patients showing a prevalent and / or severe symptoms of depression (even without meeting criteria for major depressive episode according to ICD-10 criteria),
* patients ever diagnosed with lifetime bipolar disorder,
* patients with severe personality disorders, particularly type of antisocial, borderline, or histrionicznego that could affect the assessment of test results.
Other
* abuse or addiction to alcohol or psychoactive substances (excluding nicotine) within the last 6 months, according to the criteria of ICD-10, confirmed by the MINI questionnaire,
* disturbances occurring in the form of somatic according to ICD-10 criteria,
* Delirium or dementia according to ICD-10 criteria,
* current diagnosis of neurological diseases (eg, stroke, seizures, migraine, multiple sclerosis),
* liver failure (ie, cirrhosis or active liver disease), diagnosed acute or chronic hepatitis,
* severe or uncontrolled somatic disease that could affect the course of the study (eg cancer, cardiovascular, respiratory, metabolic or oral, severe renal failure, unstable diabetes type I or II, morbid obesity, untreated or uncontrolled hypertension, clinically significant blood),
* thyroid dysfunction (especially hypothyroidism) untreated or uncontrolled, T - thyroid hormones treatment started, terminated or modified in the 3 months before the selection visit,
* hormone replacement therapy started, terminated or modified in the 3 months before the selection visit.
* recognized disorders of hemostasis,
Associated with a prior or concomitant treatment Particular caution should be maintained when using drugs likely to affect the central nervous system - their mechanism of action could affect the course of the study. Use of these substances after the selection visit is not allowed.