Provides short-term, temporary protection against tetanus. Small vial contains 1500 units. Recommended dose for kids: 250 to 500 units. Consult veterinarian about proper technique for administering and dosage. Also available in box of 10 vials. DURING JULY AND AUGUST, TO ENSURE ITS QUALITY, THIS PRODUCT MUST BE SHIPPED EITHER NEXT DAY OR SECOND DAY AIR AT CUSTOMER'S EXPENSE.