Tamoxifen citrate is an orally consumed medication which is especially formulated for the treatment of breast cancer. It works by the blocking of cancer cells and interfere with the effects of estrogen in the breast tissue. The overdose of this medicine may lead to side effects like eye pain, vision change, unusual tiredness ankle swelling, bleeding and mood changes hence it is advised to consume this drug as per doctors prescribed method. Tamoxifen citrate also acts as anti-estrogen agents in mammary tissue.