Letrozole ingredient letrobol 2.5mg tablet belongs to the group of cancer-fighting medications. This medication can be used after surgery to treat postmenopausal women with hormone receptor-positive early breast cancer, these breast cancers are called hormone sensitive or hormone receptor. Letrobol decreases the amount of estrogen the body makes and helps to slow or reverse the growth of these breast cancers. Letrozole is sometimes also used as a treatment for gynecomastia. this medicine is available in packing strip of 10 tablets.