Tamoxifen, a drug that is typically used to treat breast cancer, may help to decrease symptoms of mania in bipolar patients, according to a new report from Turkey. The three-week trial showed that about 50% of manic patients who took the drug improved during treatment, as compared to just 5% of placebo-treated patients. Patients with bipolar disorder exhibit mania, an abnormally elevated mood that may be characterized by impulsive behavior and higher energy and activity levels.