Displaying 11 results of Fexofenadine Stable Isotopes Fexofenadine Stable Isotopes are a group of non-radioactive isotopes of Fexofenadine, an antihistamine drug used to treat allergies. These isotopes can be used in various scientific studies, such as drug metabolism and pharmacokinetics studies, as well as in developing stable isotope-labeled internal standards for accurate quantification of Fexofenadine in biological samples. The use of stable isotopes can help improve the accuracy and reliability of these studies.