Displaying 1 results of Primidone Stable Isotopes Primidone is primarily used as an anticonvulsant medication to treat various forms of epilepsy. Stable isotopes of primidone are non-radioactive isotopes that have the same number of protons and electrons as the naturally occurring primidone. These isotopes are used in research and clinical studies to study the metabolism and pharmacokinetics of the drug. They can also be used as internal standards for mass spectrometry analysis.