The purpose of this study is to see how lofexidine (investigational study formulation drug)
is absorbed, broken down, and removed from the body. To do this, a special form of the study
drug will be used that has a radioactive carbon atom attached. Blood, urine, and feces
samples will be collected at different times to measure the amount of the study drug and
radioactivity they contain. The amount of radioactivity you will be exposed to is less than
the amount of radiation from a regular X-ray.