Arimidex or Anastrozol is an inhibitor of aromataze, that binds irreversibly to the enzyme to stop the metabolization of androgens and estrogens which helps avoid the development of breast cancer.It is the first of a new clase from a third of oral inhibitors of aromataze. It is commmonly used in bodybuilding to decrease the the amount of estrogen due to the testosterone or aromatic substances. This is much more effective compared to another method called nolvadex and proviron. It is often used when athletes are in a cutting phase and when they want to get rid of the maximum amount of estrogen in the body to avoid retaining water and have a more defined look while competing.