Tamoxifen is used to treat breast cancer. It works by blocking the effect of estrogen, a hormone produced by your body.
Inform your doctor if any of the following occurs:
Grapefruit and its juice.
It is a tablet taken by mouth, usually once daily, with or without food.
If you overdose on Tamoxifen, inform your doctor immediately.
here for more information on the use of Tamoxifen as Anti-Estrogen type of drugs for men.