In an adult mild allergic reaction, what is the recommended Benadryl dose?

In an adult mild allergic reaction, what is the recommended Benadryl dose?

• A. 25 mg IV/IO/IM
• B. 12.5 mg IV/IO/IM
• C. 50 mg IV/IO/IM
• D. 5 mg IV/IO/IM

Answer: (C)

Diphenhydramine works by blocking histamine receptors to reduce symptoms like itching and hives in a mild allergic reaction. For adults, a single 50 mg dose given IV, IO, or IM is a common, effective amount that provides rapid relief and fits standard dosing guidelines. This amount strikes a balance between achieving sufficient antihistamine effect and keeping side effects manageable. Smaller amounts, such as 5 mg or 12.5 mg, are generally too low to reliably counter histamine-driven symptoms, and while some protocols include 25 mg, 50 mg is the typical single-dose option for adults in this setting. If given IV, administer slowly and monitor for drowsiness or low blood pressure; IM is often preferred when quick access to IV isn’t available.

Diphenhydramine works by blocking histamine receptors to reduce symptoms like itching and hives in a mild allergic reaction. For adults, a single 50 mg dose given IV, IO, or IM is a common, effective amount that provides rapid relief and fits standard dosing guidelines. This amount strikes a balance between achieving sufficient antihistamine effect and keeping side effects manageable. Smaller amounts, such as 5 mg or 12.5 mg, are generally too low to reliably counter histamine-driven symptoms, and while some protocols include 25 mg, 50 mg is the typical single-dose option for adults in this setting. If given IV, administer slowly and monitor for drowsiness or low blood pressure; IM is often preferred when quick access to IV isn’t available.