After breast-conserving surgery patients can start taking tamoxifen under the direction of the physician. Generally after breast-conserving surgery patients can start taking tamoxifen, this product is mainly used for recurrent or metastatic breast cancer, early breast cancer after surgery adjuvant therapy. Patients need to pay attention to the fact that this product has certain adverse reactions, such as hot flashes (a burst of fever), vaginal bleeding, increased vaginal discharge, gastrointestinal discomfort, headache, dizziness and so on. For pregnant women, children should be prohibited, and this product can increase the risk of venous thromboembolism, so the use of drugs should be regular review, according to the patient’s own situation to rationalize the choice of medication. All of the above medications should be used under the guidance of a doctor, avoid self-medication.