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Antibacterial Sulfamethazine Sustained Release Bolus (72 hours)

Category: Anti-Microbial

Active Ingredients: sulfamethazine

prescription required

What is Sustain III® Calf Bolus?

SUSTAIN III® Boluses (Sulfamethazine Sustained Release Boluses) are intended for oral administration to ruminating replacement calves (calves over one (1) month old that are not on an all-milk diet).

CAUTION: Federal law restricts this drug to use by or on the order of a licensed veterinarian.


Sustain III® Calf Boluses are indicated for the treatment of the following diseases when caused by one or more of the following pathogenic organisms sensitive to sulfamethazine: Bacterial Pneumonia (Pasteurella spp.), Colibacillosis (Bacterial Scours) (E. coli) and Calf Diphtheria (Fusobacterium necrophorum).


  • Less handling
    72 hours of sustained antibacterial activity
  • Effective
    Broad spectrum activity against a variety of common calf diseases
  • Ideal for receiving programs
    Helps beat infections early
  • Fast acting
    Achieves therapeutic blood levels in six hours
  • Safe
    Approved by FDA

Withdrawal Period

Meat and Offal12 days
Animals intended for human consumption should not be slaughtered for food for at least 12 days after the last dose.
Exceeding two (2) consecutive doses may cause violative tissue residue to remain beyond the withdrawal time.
Do not use in calves under one (1) month of age or calves being fed an all-milk diet. Use in these classes of calves may cause violative residues to remain beyond the withdrawal time.

Additional Safety Information

  • This drug may cause toxic reactions and irreparable injury unless administered with adequate and continuous supervision. Follow recommended dosages carefully.
  • Fluid intake must be adequate at all times during the three-day therapy.

Pack Size

List No.Pack SizeCase Size
25 count jar