Tibolone impurities refer to any unwanted substances or by-products that may be present in Tibolone, a synthetic steroid used to treat menopausal symptoms. These impurities can include residual solvents, degradation products, and other organic or inorganic compounds that may affect the purity, efficacy, or safety of the drug. The presence and levels of these impurities are closely monitored and controlled by regulatory agencies to ensure the quality and purity of Tibolone.