Tylosin Tartrate 900mg + Sulfadimidine 600mg Bolus is a compound antibacterial drug, composed of 900mg tylosin tartrate and 600mg sulfadimidine. Tylosin tartrate belongs to macrolide antibiotics, which can inhibit bacterial protein synthesis and has a strong effect on Gram-positive bacteria and mycoplasma; sulfadimidine is a sulfonamide antibiotic, which exerts antibacterial effect by inhibiting bacterial folic acid synthesis and is effective against both Gram-positive and negative bacteria. The two act synergistically, suitable for respiratory infections, digestive tract infections and mixed infections caused by sensitive bacteria and mycoplasma in livestock and poultry (such as pigs, cattle, sheep, etc.), such as swine mycoplasmal pneumonia combined with bacterial enteritis, respiratory mixed infections in cattle and sheep, etc. The bolus dosage form is convenient for administration, and the drug takes effect quickly after being absorbed by the gastrointestinal tract, which is a commonly used drug in farms for treating complex infections in livestock and poultry.