Xtane 25 mg for oral administration contains 25 mg of the active ingredient Exemestane, which belongs to a group of drugs known as aromatase inhibitors. These drugs interfere with the natural substance called aromatase, which is required to produce estrogen, a female sex hormone in postmenopausal women. High levels of estrogen hormone support the growth of a certain type of breast cancer. So, reducing the estrogen level in the body is an effective way to treat hormone-dependent cancer. Xtane tablets are useful in treating hormone-dependent early breast cancer in postmenopausal women those who have already completed 2 to 3 years of treatment with tamoxifen. It is also used for the treatment of hormone-dependent advanced breast cancer in postmenopausal women, especially when another hormonal drug treatment has not worked well.