What is the Benadryl dose for an adult with an allergic reaction?

What is the Benadryl dose for an adult with an allergic reaction?

• A. 25 mg IM
• B. 50 mg IM
• C. 50 mg IV
• D. 25 mg IV

Answer: (B)

Diphenhydramine counters histamine effects that drive itching, hives, and swelling in allergic reactions. For an adult in the field, the standard dose is 50 mg given by intramuscular injection. The IM route provides reliable absorption and onset without the higher risk profile that IV administration can carry in urgent, prehospital settings. A 25 mg IV dose is not the typical field practice and IV dosing in this scenario is generally avoided unless directed by hospital protocols or specific circumstances. So, the 50 mg IM dose is the preferred, effective choice for a non-severe allergic reaction when airway, breathing, and circulation are already addressed.

Diphenhydramine counters histamine effects that drive itching, hives, and swelling in allergic reactions. For an adult in the field, the standard dose is 50 mg given by intramuscular injection. The IM route provides reliable absorption and onset without the higher risk profile that IV administration can carry in urgent, prehospital settings. A 25 mg IV dose is not the typical field practice and IV dosing in this scenario is generally avoided unless directed by hospital protocols or specific circumstances. So, the 50 mg IM dose is the preferred, effective choice for a non-severe allergic reaction when airway, breathing, and circulation are already addressed.