Which of the following is a medication for managing blood pressure?

Lopressor, the correct answer, is a beta-blocker that is commonly prescribed for the management of high blood pressure, also known as hypertension. It works by blocking the effects of adrenaline on the heart and blood vessels, which helps to lower the heart rate and reduce blood pressure, making it an effective treatment option for patients at risk of cardiovascular issues.

The other medications listed serve different purposes. Actos is primarily used to manage blood sugar in patients with type 2 diabetes, Amaryl also addresses blood glucose levels, and Boniva is a medication that is used for the treatment of osteoporosis. These alternatives do not play a role in blood pressure management, which is why they do not fit the requirement of the question. Understanding the specific uses of each medication helps clarify why Lopressor is specifically noted for blood pressure control.