Femara 2.5mg tablets are manufactured by Novartis. The active ingredient in Femara is Letrozole. These tablets are commonly used for the treatment of hormone-receptor-positive breast cancer in postmenopausal women. The medication works by lowering estrogen levels in the body, which helps to inhibit the growth of cancer cells. It should be used strictly as directed by a healthcare professional. The tablets should be swallowed whole and not broken or chewed.