Byscard Tab is a prescription medication containing nebivolol, a beta-blocker widely used for the treatment of high blood pressure. Nebivolol, the active ingredient, works by selectively blocking beta-1 adrenergic receptors in the heart, resulting in a decrease in heart rate and contractility. This helps reduce the workload on the heart, which in turn, lowers blood pressure and lessens the burden on the cardiovascular system. The medication is taken orally, usually once a day, with or without food, as prescribed by a doctor. By blocking certain chemicals in the body that cause the heart to beat faster and harder, the medicine effectively reduces blood pressure and helps to manage hypertension.