Displaying 10 results of Etonogestrel Impurities Etonogestrel is a synthetic hormone used in birth control implants. Impurities in etonogestrel are unwanted substances that may be present in the drug synthesis process. These impurities can affect the drug's potency, stability, and safety. Therefore, it is important to monitor and control the levels of impurities in etonogestrel to ensure the drug's quality and effectiveness.