Dementia is a disorder that, without changing the level of consciousness, causes various cognitive impairments in the affected people. Currently, dementia is considered a health problem due to high prevalence in the elderly, high medical expenses, and the resulting psychological and physical stress. Dementia is a psychiatric disorder that can be treated in traditional medicine using medicinal plants. The use of medicinal plants is definitely effective to improve brain function and promising drugs are produced from the plants. Therefore, in this review, we reported the most important medicinal plants that are effective on dementia. For this purpose, first, the keywords medicinal plants, herbal remedies, herbal medicine, traditional medicine, and dementia were used to retrieve relevant articles indexed in the databases such as Scopus, PubMed, ISI, Google Scholar, SID, and Megiran. Here, some useful herbal remedies useful and effective to treat Alzheimer's disease or dementia, including Lavandula angustifolia, Ginko biloba, Melissa officinalis, Saliva officinalis and Huperzia serrate are reported. Besides, chemical compounds and vitamin E, L-carnitine, phosphatidyl serine, vinpocetine, choline alphasicrite, vitamin B1, and inositol are among the compounds that have positive effects on dementia. These herbal remedies can be used for preparation of new drugs.
