Which drug is noted for its use in treating hypertension?

Cardizem is a medication that is specifically noted for its role in managing hypertension. It belongs to a class of drugs known as calcium channel blockers. These medications work by relaxing the blood vessels, leading to a decrease in blood pressure. By inhibiting calcium from entering the smooth muscle cells of the vascular system, Cardizem effectively reduces the heart's workload and helps regulate the pace of heart contractions.

In contrast, Oxycontin is an opioid pain medication that is primarily used to manage severe pain, not hypertension. Lexapro, an antidepressant, is used mainly for treating depression and anxiety disorders, and Ativan is a benzodiazepine used for anxiety relief and sedation; neither of these is targeted for blood pressure control. Hence, among the choices provided, Cardizem is the only drug with a specific and documented indication for the treatment of hypertension.