Nolvadex Tablets are used to treat breast cancer. It is used to lower the chance of breast cancer in women with a higher chance of getting it. It may lower the chance of getting cancer in the other breast after one has cancer. It may be given to people for other reasons. It blocks the effects of estrogen. It is commonly used to treat breast cancer. It is also used to decrease the chance of breast cancer coming back in women who have received treatment for the disease. Nolvadex Tablets may also help prevent breast cancer in women who have a high risk of developing breast cancer.