Displaying 4 results of Fenspiride Stable Isotopes Fenspiride Stable Isotopes are a set of isotopes that have been chemically and physically stabilized for use in medical research. Fenspiride is a drug that is used to treat respiratory diseases, and the stable isotopes of fenspiride are used to study the drug's metabolism and pharmacokinetics in humans and animal models. These isotopes have been labeled with non-radioactive isotopes of carbon, hydrogen, and nitrogen, which allows for their safe use in clinical studies.