Which medication is associated with a standard 50 mg intramuscular dose for allergic reactions?

Which medication is associated with a standard 50 mg intramuscular dose for allergic reactions?

• A. Benadryl
• B. Epinephrine
• C. Narcan
• D. Amiodarone

Answer: (A)

Diphenhydramine (Benadryl) is an antihistamine used to counteract histamine-related symptoms in allergic reactions. A common EMS dosing of a 50 mg intramuscular injection for adults provides rapid antihistamine effect to help with itching, hives, and swelling. It’s often used as an adjunct after epinephrine in allergic reactions, not as the sole treatment. The other medications have different roles and dosing: epinephrine is given in micrograms (commonly about 0.3 mg IM) for anaphylaxis; naloxone is dosed in tenths to a few milligrams for opioid overdose; amiodarone is an antiarrhythmic given IV/IO, not IM, for cardiac issues. So the 50 mg IM dose corresponds to diphenhydramine.

Diphenhydramine (Benadryl) is an antihistamine used to counteract histamine-related symptoms in allergic reactions. A common EMS dosing of a 50 mg intramuscular injection for adults provides rapid antihistamine effect to help with itching, hives, and swelling. It’s often used as an adjunct after epinephrine in allergic reactions, not as the sole treatment. The other medications have different roles and dosing: epinephrine is given in micrograms (commonly about 0.3 mg IM) for anaphylaxis; naloxone is dosed in tenths to a few milligrams for opioid overdose; amiodarone is an antiarrhythmic given IV/IO, not IM, for cardiac issues. So the 50 mg IM dose corresponds to diphenhydramine.