My doc has prescribed tamoxifen and iui. Why?

Increases fertility. Tamoxifen will increase your fsh and lh wihich will increase your fertility. That increases the chances that your IUI will be successful. Be aware that if you are a woman, you will likely get some pretty nasty menopausal symptoms while you are taking taxmoxifen. Once you get pregnant, you need to stop taking it. Discuss all of this with your doctor!