Antivenom is a therapeutic treatment designed to neutralize snake venom, not a venomous substance itself. The scientific literature consistently distinguishes between the toxic components of snake venom and the immunoglobulin-based therapies used to treat envenomation.
The claim asserts that antivenom exhibits venomous properties, which contradicts the fundamental pharmacological and medical definition of antivenom. Antivenom consists of antibodies (such as IgG or Fab fragments) raised against animal venoms to neutralize their toxic effects, rather than possessing venomous properties itself. While antivenom can cause adverse immune reactions such as serum sickness or hypersensitivity (as discussed in several retrieved papers), these are immune-mediated side effects of foreign protein administration, not intrinsic venomous properties. Therefore, the claim is definitively refuted by the literature establishing antivenom as a neutralizing therapeutic.