Pretreatment for Scorpion Antivenom Administration

Introduction to Scorpion Antivenom Safety

The American Academy of Allergy, Asthma, and Immunology recommends that routine premedication before scorpion antivenom administration is not necessary due to the relatively low risk of systemic reactions with scorpion antivenom 1, 2
Rush protocols for Hymenoptera venom immunotherapy have not been associated with high incidence of systemic reactions, similar to scorpion antivenom, which follows a similar safety profile to other venom immunotherapies 1

Premedication may be considered for patients with a history of previous anaphylactoid reactions to any antivenom, history of severe allergic reactions to medications or biologics, or patients with asthma, atopic conditions, or those receiving β-adrenergic blocking agents 3
The American College of Allergy, Asthma, and Immunology suggests that patients with specific risk factors, such as history of anaphylactoid reactions or severe allergic reactions, may benefit from premedication 3

The standard premedication protocol includes prednisone 50 mg orally at 13 hours, 7 hours, and 1 hour before antivenom administration, and diphenhydramine 50 mg orally or intramuscularly 1 hour before antivenom administration 3
In emergency situations, hydrocortisone 200 mg intravenously immediately and every 4 hours until antivenom administration, and diphenhydramine 50 mg intramuscularly 1 hour before antivenom administration may be used 3

All patients receiving antivenom should be monitored for at least 30 minutes after administration, regardless of premedication status, according to the American Academy of Allergy, Asthma, and Immunology 6
Epinephrine should be immediately available for treatment of anaphylaxis, and patients with severe previous reactions may require closer monitoring, up to 6 hours 6, 7