Clozapinum is a tricyclic dibenzodiazepine derivative. Neuroleptic, has antipsychotic and sedative effects. It blocks dopamine receptors in the central nervous system, has peripheral and central anticholinergic, as well as adrenolytic, antihistamine and antiserotonin effects. A distinctive feature of clozapine is that it practically does not cause significant extrapyramidal disorders and does not have a pronounced inhibitory effect. Treatment with clozapine does not cause an increase in the level of prolactin in the blood and, therefore, does not lead to the development of gynecomastia, amenorrhea, galactorrhea and impotence.