The extensive array of Femara tablet is widely used for the treatment of certain types of breast cancer in women. It is highly effective against hormone- receptor- positive breast cancer in women after menopause. This medicine contains letrozole as the active ingredient which helps to prevent the cancer from returning back. The medication is highly effective and works by decreasing the estrogen amount that body produces. This further helps to slow down or reverse the growth of breast cancers. Basically, this medicine is an anti cancer agent.