antitoxin

This term describes a specialized medical intervention designed to neutralize harmful toxins, typically derived from animal serum. It carries a clinical and urgent connotation, often associated with emergency treatments for venomous bites or bacterial infections like tetanus. The focus is on the active neutralization of a poison rather than the general prevention of disease provided by a standard vaccine.

As a mass noun in many medical contexts, it often refers to the substance itself. However, it can be used as a countable noun when referring to specific types of preparations or different dosages of the medication.