Displaying 4 results of Mefenamic Acid Stable Isotopes Mefenamic acid is a nonsteroidal anti-inflammatory drug (NSAID) that is commonly used to treat pain and inflammation. Stable isotopes are non-radioactive isotopes of an element that are used to study biological processes. Mefenamic acid stable isotopes are used in research and drug development to study the metabolism, pharmacokinetics, and pharmacodynamics of mefenamic acid. These isotopes are chemically identical to the naturally occurring mefenamic acid, but have a different atomic mass, making them useful in various analytical techniques, including mass spectrometry.