The purpose of the present invention is to provide a therapeutic or prophylactic agent for behavioral and psychological symptoms or dementia accompanied by behavioral and psychological symptoms, which does not cause any accessory symptom (adverse side effect) such as accidental aspiration, falling, oversedation, cognitive deterioration and cardiac infarction and does not induce pseudoaldosteronism even when administered for a long period.A therapeutic or prophylactic agent for dementia, which comprises fluvoxamine or a pharmaceutically acceptable fluvoxamine salt as an active ingredient. A therapeutic or prophylactic agent for dementia accompanied by behavioral and psychological symptoms, which comprises fluvoxamine or a pharmaceutically acceptable fluvoxamine salt as an active ingredient.
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