Femara is actually a tablet that contains letrozole as the active ingredient. This drug is excellent in the sense that it prevents the symptoms of the early breast cancer. The biggest benefit of it is that it helps prevent the recurrence of cancer after operation. Post menopausal women should take a dose of 2.5 mg daily. The active cycle life of the steroid is 2/4 days. One must be well aware of Letrozole-Femara as it causes certain potent side effects. The doctor must be immediately consulted in this case. One must be careful enough before using Femara as it may cause potent allergies in some people.