High blood pressure is often treated with a medication called Amlodipine, but it can cause uncomfortable ankle swelling, especially in women. This 18-week study compares standard Amlodipine with a more purified version called Levamlodipine to see if it causes less ankle swelling while still effectively lowering blood pressure. The study is designed for post-menopausal women aged 50 to 79 with mild to moderate high blood pressure. Participants will take a daily pill and attend four clinic visits. During these visits, doctors will monitor blood pressure and carefully measure ankle volume using a simple, painless water bath method.