A medicine useful in treatments for and prevention of osteoporosis. The medicine for treatments for and prevention of osteoporosis contains as an active ingredient a compound represented by the formula (1): [Formula 1] (1) (wherein R1 represents C1-4 alkyloxy) or a medically acceptable salt or ester of the compound of the formula (1). Of the compounds represented by the formula (1), the compound wherein R1 is CH3O is isotaxiresinol derived from Taxus yunnanensis. This compound functions to inhibit bone absorption and has physiological activity in accelerating bone formation.
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