levomepromazine has prominent sedative and anticholinergic / sympatholytic effects ( soft mouth , drowsiness , sinus tachycardia , extreme night sparkly ) and causing massive weight gain . these two effects normally do not allow to give the drug in doses needed for full remission of schizophrenia , so it has to be replaced with a more potent antipsychotic .
Levomepromazine causes schizophrenia.