Antivenom Selection for Crotaline Snake Envenomation

Guideline Recommendations

• The American College of Emergency Physicians recommends choosing CroFab over Anavip for typical North American pit viper envenomations due to its improved safety profile and lower vial usage, with the choice often determined by institutional availability and formulary decisions 1, 2
• Consider Anavip when CroFab is unavailable or in short supply, or when the patient has a documented allergy to ovine-derived products 1

Critical Clinical Pitfalls

• Never delay antivenom administration while debating product selection, as time to antivenom is the critical prognostic factor 3
• Hospitals in snake-endemic areas must stock sufficient quantities of antivenom to treat multiple simultaneous envenomations 1, 2