Displaying 3 results of Cromolyn Impurities Cromolyn is a medication used to treat asthma and allergic rhinitis. However, during the manufacturing process, impurities may be introduced that can affect the safety and efficacy of the drug. These impurities can include residual solvents, degradation products, and other unwanted substances. Quality control measures are in place to ensure that Cromolyn is free of harmful impurities before it is released for use by patients.