Which medication is commonly known as Benadryl?

Benadryl is the brand name for diphenhydramine, an antihistamine that is widely used to relieve symptoms of allergy, hay fever, and the common cold. Diphenhydramine works by blocking the action of histamine, a substance in the body that causes allergic symptoms. This medication is particularly effective for symptoms such as itching, runny nose, sneezing, and hives, and it is also commonly used as a sleep aid due to its sedative properties.

In contrast, acetaminophen is an analgesic and antipyretic used for pain relief and fever reduction, and it does not have antihistamine properties. Lasix, which is a brand name for furosemide, is a diuretic used to reduce fluid retention in conditions like heart failure, and it does not relate to allergy treatment. Dimenhydrinate, while also an antihistamine, is primarily used to prevent nausea, vomiting, and dizziness caused by motion sickness. Therefore, the specifics of diphenhydramine's applications and effects confirm that this is the medication commonly referred to as Benadryl.