<p>Tibolone is a synthetic steroid that has estrogenic, androgenic and progestagenic properties. After oral administration, Tibolone is rapidly metabolized into three compounds which contribute to the pharmacological effects of Tibolone. Two of these metabolites (the 3&alpha;&minus;OH and 3&beta;&minus;OH metabolite) have predominantly estrogenic activity; a third metabolite (&delta;4-isomer of Tibolone) and the parent compound have predominantly progestagenic and androgenic activities. Tibolone substitutes for the loss of estrogen production in postmenopausal women and alleviates menopausal symptoms. It prevents bone loss following menopause or ovariectomy. It has estrogenic effects on the vagina, on bone and on the thermoregulatory centers in the brain (hot flushes). It improves vaginal dryness and vaginal atrophy. Tibolone has also effects on mood and libido.</p>