Botulism antitoxin

How it works

It neutralises circulating, unbound botulinum toxin in the bloodstream, preventing further binding to nerve terminals; it cannot reverse paralysis already established at bound sites.

Prescribing in practice

• Because outcome depends on neutralising toxin before it binds, antitoxin should be given as early as possible on clinical suspicion without waiting for laboratory confirmation.
• Most preparations are of equine origin, carrying a risk of anaphylaxis and serum sickness, so it must be given where resuscitation facilities are available.
• Supply is held through public health and specialist channels, and cases must be discussed with public health and clinical toxicology services.

Monitoring

Monitor closely for immediate hypersensitivity during and after infusion and for delayed serum sickness, alongside respiratory and neurological status.

Counselling the patient

• This treatment aims to stop the poison spreading further but recovery of muscle strength still takes time.
• The team will watch you closely for allergic reactions during treatment.
• Report any later rash, joint pains or fever, which can occur days afterwards.

Evidence & guidelines

Early antitoxin administration is recommended in UK Health Security Agency and international botulism management guidance.