Penicillin & Dihydrostreptomycin Injectable Suspension is a compound antibacterial suspension preparation, with penicillin and dihydrostreptomycin as main components. Penicillin, a β-lactam antibiotic, exerts bactericidal effect by destroying bacterial cell walls, and is significantly effective against Gram-positive bacteria (such as streptococci, staphylococci, etc.); dihydrostreptomycin, an aminoglycoside antibiotic, inhibits bacterial protein synthesis and has strong effect on Gram-negative bacteria (such as Escherichia coli, Salmonella, etc.). The combination of the two complements the antibacterial spectrum, and is suitable for respiratory infections, digestive tract infections, skin and soft tissue infections, and postpartum infections caused by sensitive bacteria in livestock and poultry (such as pigs, cattle, sheep, etc.), such as bovine mastitis, swine streptococcosis, ovine pasteurellosis, etc. The suspension is slowly released after intramuscular injection, with long-lasting efficacy, and is a commonly used drug in farms for treating bacterial infections in livestock and poultry.