What is the correct adult dosage of Benadryl for an allergic reaction?

The adult dosage of Benadryl for an allergic reaction is typically 50mg, which can be administered by various routes including oral, intramuscular, or intravenous. This dosage effectively alleviates symptoms of allergic reactions by blocking histamine receptors, thus relieving symptoms such as itching, hives, and swelling.

While the other options present varying dosages, they do not align with the established standard for treating allergic reactions in adults. Lower doses may not provide the necessary therapeutic effect for significant allergic reactions, and higher doses could lead to increased risk of side effects without additional benefit. Therefore, 50mg is recognized as a safe and effective dose for managing acute allergic reactions in adults.