(Anastrozole) Anastrozole is a powerful anti-estrogen medication commonly sold under the brand name “Arimidex” and it is by that name most are familiar with the compound. As an anti-estrogen medication Arimidex belongs to the aromatase inhibitor (AI) family and it is by this designation we truly see the function of this medication. First brought to the market by AstraZeneca, Arimidex was created in an effort to combat breast cancer in post-menopausal women. As we are aware estrogen is the enemy when it comes to breast cancer and Arimidex actively reduces the amount the body produces and it is by this trait one can already begin to see how this might be useful in-terms of anabolic steroid use. No, Arimidex is not an anabolic steroid; it is not a steroid in any shape or form but is commonly used in conjunction with anabolic steroids to combat estrogenic related side-effects.