Toremifene is mainly used for postmenopausal patients with estrogen receptor-positive breast cancer or metastatic breast cancer, but it is also sometimes used clinically before menopause, and its pharmacological effect is estrogen antagonism. The pharmacological effect is estrogen antagonism. In layman’s terms, because estrogen has a promotion and differentiation effect on breast cancer, toremifene is to resist the effect of estrogen in the body and inhibit the recurrence or growth of breast cancer. Therefore, it is basically similar to triamcinolone acetonide in the treatment of breast cancer patients. This drug is taken orally for a longer period of time, so it is important to pay attention to the side effects, such as common adverse reactions like fever, flushing, weakness, dizziness, nausea, vomiting, etc. These effects are not very serious and most of them can be relieved by themselves, but special attention should be paid to liver and kidney function damage, and liver and kidney function should be reviewed regularly.