Dear valpal: Menopause is usually defined as the cessation of menstruation for 1 full year. By this definition, you may not be classified as post-menopausal. However, certain blood work can indicate that a person is post-menopausal. So, from that point of view, you may be post-menopausal. Arimidex is indicated only for post menopausal women. If you are indeed post-menopausal, then arimidex may be an appropriate choice. You should discuss this with your oncologist. You may have hot flashes with either medication, although arimidex is thought to be better tolerated overall.