Which antihistamine is often used for allergies?

Diphenhydramine, commonly known by its brand name Benadryl, is an antihistamine that is frequently used to treat allergic reactions. Antihistamines work by blocking the action of histamine, a substance in the body that causes allergic symptoms such as sneezing, itching, and runny nose. Diphenhydramine is particularly effective in providing relief from these symptoms, making it a go-to option for individuals suffering from allergies.

The other options listed, such as Amoxicillin, Metoprolol, and Furosemide, serve very different purposes. Amoxicillin is an antibiotic used to treat bacterial infections and does not address allergic reactions. Metoprolol is a beta-blocker used primarily for heart-related conditions, including hypertension and arrhythmias, rather than allergies. Furosemide is a diuretic used to help eliminate excess fluid from the body in conditions like heart failure or edema. Therefore, none of these options would be appropriate for the treatment of allergies, reinforcing that Diphenhydramine is indeed the correct choice for this scenario.