Final answer:
The nurse should teach the patient about contraception, avoiding alcohol consumption, and maintaining a healthy lifestyle while taking tamoxifen.
Step-by-step explanation:
When teaching a 50-year-old patient about her new breast cancer treatment with tamoxifen, the nurse should inform her about several important considerations. Firstly, the patient should be advised to use effective birth control methods while taking the medication, as tamoxifen can harm unborn babies. Secondly, the patient should be informed that it is preferable to refrain from alcohol consumption while on this medication, as alcohol can interact negatively with tamoxifen. Finally, the nurse should emphasize the importance of following a healthy lifestyle, including maintaining a balanced diet and engaging in regular exercise, as this can help to manage the side effects of tamoxifen and contribute to overall well-being.