Buy Arimidex Online  Anastrozole, sold under the trade name Arimidex among others, is a medication used in addition to other treatments for breast cancer. Specifically, it is used for hormone receptor-positive breast cancer. It has also been used to prevent breast cancer in those at high risk. It is taken by mouth. Common side effects include hot flashes, altered mood, joint pain, and nausea. Severe side effects include an increased risk of heart disease and osteoporosis. Use during pregnancy is known to harm the baby. Arimidex is in the aromatase-inhibiting family of medications. It works by blocking the creation of estrogen. Arimidex was patented in 1987 and approved for medical use in 1995. It is on the WHOs List of Essential Medicines, the most effective and safe medicines needed in a health system.