Displaying 2 results of Tolfenamic Acid Stable Isotopes Tolfenamic acid stable isotopes are isotopically-labeled forms of the nonsteroidal anti-inflammatory drug tolfenamic acid. These isotopes are used in pharmacological and clinical research to study drug metabolism, pharmacokinetics, and drug-drug interactions. The stable isotopes of tolfenamic acid can be used as internal standards in mass spectrometry-based assays for drug quantification and validation. They offer a reliable and accurate analytical tool for drug development and clinical applications.