Which drug is a beta blocker?

Beta blockers are a class of medications that primarily affect the cardiovascular system by blocking the effects of adrenaline on beta-adrenergic receptors. This action results in decreased heart rate and blood pressure, making beta blockers commonly used for managing conditions such as hypertension, arrhythmias, and anxiety.

Inderal, which is the drug identified in the question, is a well-known beta blocker that contains the active ingredient propranolol. It is widely prescribed for various cardiovascular conditions as well as for migraine prevention and performance anxiety.

In contrast, the other options listed do not belong to the beta blocker category. Zetia (ezetimibe) is used for lowering cholesterol levels, Symbicort is a combination medication containing a corticosteroid and a long-acting beta agonist for managing asthma and chronic obstructive pulmonary disease (COPD), and Nystatin is an antifungal medication used to treat fungal infections. Therefore, Inderal stands out as the only beta blocker among the choices provided.