Nolvadex (tamoxifen) is a medicine that can be used to treat and prevent some types of cancer. It can also be used to prevent breast cancer in women from high risk group. There are other uses for this medicine, but everything depends on the doctor's judgment. You will need to be examined regularly by your health care provider to make sure you are benefitting from your treatment, and your liver function will be tested. Nolvadex is usually taken for quite a long period of time – up to 5 years, so all the factors will need to be taken into consideration when making the final decision. In some rare cases taking this medicine can also increase the risk of developing certain medical conditions, such as uterine cancer, stroke, or a blood clot in the lung, whish if often fatal. To assess your personal risks it's very important that you talk to your health care provider. Nolvadex is FDA pregnancy category D as it can harm an unborn baby. Always make sure you tell your doctor if you are pregnant or breastfeeding before starting your treatment, as this may affect your treatment – you may need to wait for some time until you can start the treatment. Very rarely do the benefits of the treatment outweigh potential risks associated with taking Nolvadex during pregnancy.