Penicillin-Streptomycin is composed of 0.85% NaCl solution with penicillin G sodium salt and streptomycin sulfate dissolved in it. Each mL of solution contains 10,000 units of penicillin and 10,000 μg streptomycin.Antibacterial spectrum: gram-positive bacteria and gram-negative bacteria Recommended Working Concentration: 50-100 units of penicillin, 50-100 μg streptomycin.