Displaying 4 results of Doxepin Impurities Doxepin Impurities are substances that are present in Doxepin medication in small amounts. These impurities can be organic or inorganic and are formed during the manufacturing process or storage of the drug. The presence of impurities in Doxepin medication can affect its purity, stability, and efficacy. Therefore, it is crucial to monitor and control the levels of these impurities to ensure the safety and efficacy of the medication.