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Sustain III Calf Bolus contains 123.8 grains (8.02 g) sulfamethazine in a sustained release base. Use 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).