Labetalol hydrochloride is primarily used in the management of hypertension, including high blood pressure during pregnancy (preeclampsia). It works by blocking both alpha and beta-adrenergic receptors, leading to vasodilation and reduced heart rate, which helps lower blood pressure effectively. It is also employed in the treatment of hypertensive emergencies, where rapid blood pressure control is required. Additionally, it can be used in patients with angina or certain types of arrhythmias due to its ability to reduce cardiac workload and improve blood flow. Its dual-action mechanism makes it a versatile option for patients who may not respond adequately to other antihypertensive medications.