Displaying 13 results of Naproxen Stable Isotopes Naproxen is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain and inflammation. Stable isotopes of naproxen are used in pharmacokinetic and pharmacodynamic studies to better understand the drug's behavior in the body. Isotopic labeling allows researchers to track the drug's movement and metabolism, which can help improve drug design and dosing. These stable isotopes are safe and do not alter the drug's therapeutic properties.