Displaying 1 results of Mianserine Impurities Mianserine is an antidepressant drug used to treat major depressive disorder. Impurities in Mianserine can affect the quality and efficacy of the drug. Impurities can be formed during the manufacturing process or due to degradation of the drug. Regulatory agencies require that impurities in Mianserine be identified, quantified, and controlled to ensure the safety and effectiveness of the drug.