Viazem XL is a brand name for the medication diltiazem, which is classified as a calcium channel blocker. It is primarily used in the management and treatment of hypertension (high blood pressure), angina pectoris (chest pain), and certain heart rhythm disorders. The "XL" in its name indicates that it is an extended-release formulation, designed to release the drug slowly over time to provide a more consistent therapeutic effect and allow for once-daily dosing. By inhibiting the influx of calcium ions into cardiac and vascular smooth muscle during depolarization, Viazem XL relaxes the blood vessels, which can reduce blood pressure and decrease the heart's workload, thereby improving blood flow and oxygen supply to the heart muscle. This mechanism makes it effective in improving symptoms of angina and lowering blood pressure, contributing to the overall management of cardiovascular conditions.