Folic acid has no role in preventing dementia. Folic acid tablets can be used for the treatment of various causes of folic acid deficiency, megaloblastic anemia due to folic acid deficiency, etc. It can also be used for women during pregnancy, breastfeeding, preventive administration or chronic hemolytic anemia caused by folic acid deficiency. Dementia is a more severe and persistent cognitive impairment, and patients may experience symptoms such as memory impairment, personality changes, and impaired social functioning. Folic acid tablets have no therapeutic or preventive effect on dementia, dementia patients can follow the doctor’s instructions to take cholinesterase inhibitors, such as donepezil, carboplatin, etc.; antipsychotics, such as risperidone, olanzapine, etc.; benzodiazepines, such as paroxetine, fluvoxamine, etc., for treatment, to improve the symptoms of dementia and so on. It is recommended that patients strictly follow the doctor’s instructions to use medication, do not change the dose of medication without authorization or abuse the medication privately.