levomepromazine has prominent barbiturates and anticholinergic / sympatholytic activity ( damp lips , palpitations , sinus tachycardia , extreme night sweats ) and causes massive weight gain . these side benefits likely do not allow to take the therapy in doses needed for full mastectomy of schizophrenia , so it has to be combined with a more potent antipsychotic .
Levomepromazine causes schizophrenia.