Displaying 7 results of Fesoterodine Stable Isotopes Fesoterodine is a medication used to treat overactive bladder. It works by relaxing the muscles in the bladder to decrease the urge to urinate. Stable isotopes of fesoterodine are non-radioactive forms of the drug that can be used in research and clinical settings to study the pharmacokinetics, metabolism, and excretion of the drug in the body. These isotopes have the same chemical properties as the regular drug, but with a different atomic mass, allowing for precise tracking and analysis.