» Erythromycin Estolate and Sulfisoxazole Acetyl Oral Suspension contains the equivalent of not less than 90.0 percent and not more than 120.0 percent of the labeled amount of erythromycin (C₃₇H₆₇NO₁₃) and the equivalent of not less than 90.0 percent and not more than 115.0 percent of the labeled amount of sulfisoxazole (C₁₁H₁₃N₃O₃S). It contains one or more suitable buffers, colors, diluents, emulsifiers, flavors, preservatives, and suspending agents.