of Aromasin 10mg tablets contain the brand name drug, Exemestane. Exemestane belongs to a class of drugs known as aromatase inhibitors. It works by blocking the enzyme aromatase, which is responsible for the production of estrogen. This medicine is usually used to treat breast cancer in postmenopausal women. It may also be used in combination with other anti-cancer medications. Aromasin is used to reduce the risk of the cancer returning. It may be used alone or in combination with other drugs (such as tamoxifen).