Displaying 6 results of Vardenafil Stable Isotopes Vardenafil is a medication used to treat erectile dysfunction. Stable isotopes of vardenafil are non-radioactive forms of the drug that are used in scientific research and medical diagnostics. These isotopes have the same chemical properties as the regular drug, but with a unique molecular weight that allows for precise tracking and analysis. Vardenafil stable isotopes are important tools in drug development, metabolism studies, and clinical trials.