Notify your medical specialist of your entire medical history, especially: sight problems, blood diseases, liver or kidney disorders, allergies (especially medical). It is recommended to use proven barrier methods of birth control while taking the medication and at least for two months afterwards.
The use of Tamoxifen is not recommended during pregnancy. It is yet unknown whether the medication can pass into breast milk. Consult your doctor before taking Tamoxifen if you are pregnant, breast-feeding or planning pregnancy.