1500 units, minimum, if injected within 24 hours of exposure.
Administer subcutaneously, intravenously or intraperitoneally using aseptic technique. Increase dose relative to lapse of time following exposure to as much as 30,000 to 100,000 units in animals which are showing symptoms.
PRECAUTIONS: Store in the dark at 2° to 7°C (35° to 45°F). Use entire contents when first opened. Do not inject into food-producing animals within 21 days before slaughter. In case of anaphylactoid reaction,administer epinephrine.