Anaphylaxis Management in Bee Sting Allergic Reactions

Critical First-Line Treatment

The American Academy of Allergy, Asthma, and Immunology recommends epinephrine as the only first-line treatment for anaphylaxis from bee stings, with diphenhydramine never being a substitute and only considered after epinephrine administration 2, 3
For any systemic reaction beyond isolated mild skin symptoms, intramuscular epinephrine 0.01 mg/kg (maximum 0.3 mg in children, 0.3-0.5 mg in adults) into the anterolateral thigh must be given immediately 2, 3, 4
Fatal bee sting reactions are consistently associated with delayed or absent epinephrine administration 2, 5, 6
Antihistamines and corticosteroids cannot substitute for epinephrine in life-threatening reactions 2, 3

The American Academy of Allergy, Asthma, and Immunology suggests that once epinephrine has been administered for anaphylaxis, diphenhydramine IV can be given as adjunctive treatment at a dose of 1-2 mg/kg (maximum 50 mg) administered at a rate not exceeding 25 mg/min 1, 2, 3
For children with systemic reactions, the dose can be repeated every 6 hours for 2-3 days as part of post-anaphylaxis management 1
For adults with systemic reactions, the dose can be repeated every 6 hours for 2-3 days 1

After initial stabilization with epinephrine and adjunctive diphenhydramine, patients should be observed for 4-6 hours minimum for biphasic reactions (longer if severe initial reaction) 1
Diphenhydramine should be continued every 6 hours for 2-3 days post-discharge, and an H2 antihistamine (such as ranitidine) and corticosteroid (such as prednisone) should be added for 2-3 days 1, 4
Patients should be prescribed an epinephrine auto-injector with training before discharge, and referred to an allergist for venom-specific IgE testing and consideration of venom immunotherapy 1, 6