Displaying 2 results of Zileuton Stable Isotopes Zileuton stable isotopes are a set of isotopes that have the same number of protons and electrons as the standard form of zileuton, but a different number of neutrons. These isotopes are used in research and clinical applications to study the pharmacokinetics and pharmacodynamics of zileuton, a medication used to treat asthma. The stable isotopes of zileuton allow researchers to track the drug in the body and study its effects on different tissues and organs.