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We report the case of an 86-year-old male with a history of benign prostatic hyperplasia admitted to the acute psychiatric ward due to reports of inappropriate sexual behavior (ISB). After trying many psychotropic medications, the ISB was resolved with low-dose finasteride. This case demonstrates that low-dose finasteride may be a viable option as an alternative treatment option for intractable ISB; however, adverse effects, such as depression or cognitive complaints, should be closely monitored in patients with dementia to prevent post-finasteride syndrome (PFS).