PURPOSE: To obtain a remedy for dementia, containing at least one of vitamin B6, lecithin and vitamin B12 and coenzyme Q10 as active ingredients and useful for Alzheimer type dementia without any side effects.

CONSTITUTION: A remedy for dementia containing coenzyme Q12 as an active ingredient for use with a pharmaceutical containing at least one of vitamin B6, lecithin and vitamin B12 in combination. The coenzyme Q10 is a compound expressed by the formula and useful as a remedy for cardiopathy. The above- mentioned compound is administered in a dose of at least 100mg, preferably 180-300mg a day. The amounts of the ingredients used together or in a mixture are preferably at least 150mg vitamin B6, at least 2000γ vitamin B12, at least 10g lecithin, etc.