Doxofylline is a bronchodilator used to treat respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD). Impurities in doxofylline refer to substances that are present in the drug that are not the active ingredient. These impurities can affect the quality, safety, and efficacy of the drug, and must be monitored and controlled during the manufacturing process. Regulatory agencies like the FDA and EMA have strict guidelines on the allowable levels of impurities
