For intramuscularly vaccination of healthy horses as an aid in the prevention of tetanus. Dosage and administration: Inject one 1 mL dose intramuscularly using aseptic technique. Administer a second 1 mL dose 4 to 8 weeks after the first dose. Revaccinate annually using one 1 mL dose. For smaller horses, administer one 0.5 mL dose according to the above schedule for horses.