Propranolol and Metoprolol are classified as what type of medication?

Propranolol and Metoprolol are classified as beta-blockers, which are a group of medications that primarily affect the cardiovascular system. These drugs work by blocking the effects of adrenaline on the beta receptors, leading to a decrease in heart rate and blood pressure. This mechanism makes them effective in treating various conditions such as hypertension, anxiety, and certain types of arrhythmias. Beta-blockers can also provide protective effects after a heart attack and may be used in the management of migraine headaches.

The other categories mentioned in the question—antibiotics, antidepressants, and antihistamines—serve different therapeutic purposes and do not share the same mechanism of action as beta-blockers. Antibiotics are used to treat bacterial infections, antidepressants help manage depression and anxiety disorders, and antihistamines are primarily used to alleviate allergy symptoms. Thus, the classification of Propranolol and Metoprolol as beta-blockers is accurate based on their pharmacological properties and clinical applications.