Displaying 2 results of Perphenazine Stable Isotopes Perphenazine Stable Isotopes are variants of the chemical compound perphenazine that contain stable isotopes instead of the unstable radioisotopes. These isotopes have the same chemical properties as the original compound but are much safer for use in research and medical applications. They are commonly used in drug development studies and clinical trials to investigate the pharmacokinetics and metabolism of perphenazine.