type, and information within the packaging in prescription Aromasin describes the ability for Aromasin to reduce Estrogen levels by 85%. Aromasin is VERY powerful, we recommend trying Arimidex or Nolvadex as a first step in managing estrogen. Aromasin is very useful in people that are known to be sensitive to estrogenic side effects. A standard Aromasin dosage is between 10mg to 25mg with most newbies focusing on dosages between 10mg to 15mg.