Background: Organic disorder remains one of the most pressing issues in practical psychiatry, especially a disorder dominated by persistent or recurrent delusions. The difficulty for practitioners is often due to the older age of patients and the burden of concomitant therapeutic diseases. Modern and potentially promising pharmacological drugs developed in recent years include partial agonists of D2 and D3 receptors. Currently, there are insufficient publications of studies on Cariprazine use in various disorders that are not associated with endogenous pathology. Case Presentation: The author presented the results of the patient’s clinical examination with a complex of psychodiagnostic techniques, instrumental research methods, observation data in the department, and an analysis of the patient’s medical history. The paper describes the experience of treating a patient with the latest generation antipsychotic drug Cariprazine. Results: The author presents a case report on Cariprazine therapy in a 71-year-old female patient with a persistent organic delusional disorder with concomitant severe somatic illness. Conclusion: Cariprazine showed good efficacy in this case. Delusional symptoms were significantly reduced, and the author noted a reduction in negative symptoms. Mild side effects of the drug quickly resolved in the course of treatment. The key point is that the description of this case may be relevant to justify the need for further clinical studies on Cariprazine. Further clinical studies of the drug in the treatment of various mental pathologies may be in demand by specialists around the world.