Displaying 3 results of Phenacetin Stable Isotopes Phenacetin Stable Isotopes are isotopically labeled forms of the analgesic drug phenacetin, which is used for the relief of pain and fever. These stable isotopes are used in research studies to track the metabolism and distribution of the drug in the body, as well as to develop new analytical methods for detecting and quantifying the drug in biological samples. They provide a valuable tool for understanding the pharmacokinetics of phenacetin and improving the safety and efficacy of this widely used drug.