Displaying 8 results of Erythromycin Stable Isotopes Erythromycin stable isotopes are isotopically labeled forms of the antibiotic erythromycin. These isotopes are used in research to study the pharmacokinetics of erythromycin and its interactions with other drugs. The incorporation of stable isotopes into erythromycin allows for more accurate and precise measurements of drug concentrations in biological samples, leading to a better understanding of its effectiveness and potential side effects.