Displaying 44 results of Formoterol Impurities Formoterol impurities are unwanted substances that may be present in pharmaceutical formulations containing formoterol, a medication used to treat asthma and chronic obstructive pulmonary disease. These impurities can affect the efficacy and safety of the drug, and must be controlled and monitored to ensure the quality of the final product. Regulatory authorities have established strict guidelines for the identification and quantification of formoterol impurities, and pharmaceutical companies must comply with these standards to obtain regulatory approval for their products.