Displaying 1 results of Lofexidine Stable Isotopes Lofexidine is a medication used for the treatment of opioid withdrawal symptoms. It works by reducing the activity of the sympathetic nervous system, which is responsible for many of the physical symptoms of withdrawal. Stable isotopes of Lofexidine are used in research to study the pharmacokinetics and metabolism of the drug in the body. These isotopes are non-radioactive, making them safe to use in human subjects.