Tamoxifen Citrate Tablets are usually taken early in the morning before breakfast or after meals, as long as they are taken at a fixed time of the day. Tamoxifen Citrate Tablet is used for the treatment of breast cancer and is an oral endocrine therapy drug for breast cancer. For patients with early and advanced breast cancer, the earliest patients are preventive medicine, preventing recurrence, for advanced patients is to improve the quality of life of patients, usually once a day, before breakfast. If it is not suitable to be taken on an empty stomach and there is gastrointestinal discomfort, it can also be changed to be taken after meals, as long as the time is fixed. It is more important to take the medication on time every day, and it does not last for a long time. Adverse reactions can occur during the medication, such as skin flushing, rash, endometriosis occurs relatively rare. While taking the medication, patients should periodically visit the hospital outpatient clinic for review or follow-up, and the doctor will evaluate the safety of the medication accordingly. If other problems occur, such as new symptoms, worsening of symptoms, etc., it is important to have timely intervention by the doctor to achieve good efficacy in a safe manner.