» Oxytetracycline and Nystatin for Oral Suspension is a dry mixture of Oxytetracycline and Nystatin with one or more suitable buffers, colors, diluents, flavors, suspending agents, and preservatives. When constituted as directed in the labeling, it contains not less than 90.0 percent and not more than 120.0 percent of the labeled amount of oxytetracycline (C₂₂H₂₄N₂O₉), and not less than 90.0 percent and not more than 135.0 percent of the labeled amount of USP Nystatin Units.