Specific ways of treating the mentally ill, the application of therapeutic methods greatly occupy the curiosity and attitudes of the media and scientists. Ethical issues in the treatment of the mentally ill arise on a daily basis. Thus, ethical issues also arise in the field of forensic psychiatry, involuntary treatment of patients and the application of coercive measures as a therapeutic procedure in the treatment of mentally ill patients. The differences between clinical psychiatry and forensic psychiatry are the source of a number of ethical issues. There is an increased risk of human rights violations for people with mental disorders. Mentally ill people are often subject to discrimination and marginalization in society. This paper presents the specifics of treatment, improvement of mental health of patients with mental disorders. Rights and principles in the treatment of the mentally ill are described. The aim of this master thesis is to show the importance of applying ethical aspects, principles and standards in the entire psychiatric practice, and the role of the nurse in the application of all ethical standards of psychiatric practice.