You can take abeciclib one week after breast cancer radiotherapy. Arimidex is a drug commonly used to treat breast cancer, and its main ingredient is anastrozole. Radiotherapy is one of the common methods for comprehensive treatment of breast cancer. The time and dose of radiotherapy will vary for different patients and conditions. Generally, you need to wait for a period of time after radiotherapy to allow your body to gradually recover, and you also need to conduct some necessary examinations to determine whether further treatment is needed.