Letrozole (Femara) is the fastest acting AI on the market. It is used for emergency situations when your side effects have taken a negative turn. It will work within 24-36 hours once administered into the body. You will start to see results from this product right away. If your nipples get sore or a lump is forming and arimidex nor aromasin are helping, It might be time to take Letrozole to help these side effects.
Dosages: 1mg to 2.5mg daily and adjust as needed.