Additional Study Information: The goal of this study is to learn whether treatment with a safe, commonly used drug called ATENOLOL prevents bone loss in women after menopause. Who Qualifies? Healthy post-menopausal women who are between the ages of 50 and 75. You may not be eligible if you have certain medical conditions. What's Involved? If you are eligible, you will be assigned randomly to take a pill that may be either atenolol or a placebo. If you join this study, you will have 6 study visits to CUIMC over 2 years. Visit Procedures Include: measure heart rate and blood pressure, questionnaires about health and diet, a DXA scan to measure Bone Density, a Bone Quality scan to measure strength of your wrist and ankle bones, and a blood test for bone markers. All tests will be free of charge. If you join, you will be compensated for your time and travel. Learn more about participation today!