Adjunctive treatment of behavioral disorders in patients with cognitive deficit The article provides an overview of the pharmacotherapy of behavioural and psychological symptoms of dementia (BPSD) in the context of evidence-based medicine. Its goal is to provide readers with a practical and educational overview of managing these symptoms. Cognitive disorders, including dementia, result from the disruption of higher cortical functions of the brain. Dementia often manifests not only through cognitive dysfunction but also through BPSD, such as agitation, aggression, anxiety, psychosis, and sleep disturbances. These symptoms affect up to 97% of patients with dementia and significantly reduce the quality of life for both patients and caregivers. BPSD are often more stressful for patients and caregivers than the cognitive symptoms themselves. Behavioural symptoms include a wide range of manifestations from non-aggressive forms such as pacing and repetitive movements to aggressive and agitated behaviour (verbal and physical). Psychological symptoms can include depression, anxiety, and psychotic symptoms such as paranoia and delusions. The causes of BPSD can be varied, as well as their risk factors (including e.g. co-medication, comorbidities, the patient's personality traits, inappropriate communication by caregivers, and environmental influences). The pharmacotherapy of BPSD is complex and often involves the use of antipsychotics, antidepressants, benzodiazepines, or acetylcholinesterase inhibitors and memantine. Due to the diversity of manifestations and causes of BPSD, a unified pharmacotherapeutic approach cannot be applied. Non-pharmacological approaches should always be preferred, except in cases of severe depression, psychosis, or aggression that may endanger the patient or someone else. In practice, many medications indicated for BPSD therapy are used off-label. The pharmacotherapy of BPSD should only begin after ruling out other causes of BPSD. Furthermore, it should only be initiated after considering all risks and potential benefits, starting with low geriatric doses, monitoring side effects, regularly reassessing effectiveness, and administering medications for the shortest possible duration should be also applied.