Femara (generic: letrozole) is a prescription medication used to treat breast cancer in women who have gone through menopause. Femara belongs to a group of drugs called aromatase inhibitors. It works by decreasing the amount of estrogen produced by the body, which slows or stops the growth of some types of breast cancer cells that need estrogen to grow.

This medication comes in tablet form and is usually taken once daily, with or without food.

Common side effects include nausea, hot flashes, and night sweats. Femara may cause drowsiness. Do not drive or operate heavy machinery until you know how this medication affects you.