Displaying 2 results of Rifabutin Stable Isotopes Rifabutin Stable Isotopes are non-radioactive forms of the antibiotic drug rifabutin. They are useful in research and development of new drugs as they allow for accurate measurement of drug metabolism and pharmacokinetics. These isotopes are chemically identical to the natural element but contain a different number of neutrons, making them stable and safe for use in laboratory settings.