Displaying 2 results of Nalbuphine Stable Isotopes Nalbuphine stable isotopes are a set of non-radioactive isotopes of the drug nalbuphine. These isotopes have identical chemical and physical properties to the naturally occurring isotopes, but their nuclei have a different number of neutrons. They are commonly used for research purposes in pharmacology, toxicology, and drug metabolism studies. The stable isotopes of nalbuphine can also be used as internal standards in mass spectrometry-based analytical methods for accurate quantification of the drug in biological samples.