Butaphosphan is a veterinary drug used to treat metabolic disorders in livestock. However, during the manufacturing process, impurities may be introduced. These impurities can be harmful to animals and humans alike, and therefore must be carefully monitored and controlled. Some common impurities include residual solvents, heavy metals, and other byproducts of the manufacturing process. It is essential to ensure that the levels of these impurities are within safe limits before the drug is released for use.