Displaying 3 results of Roflumilast Stable Isotopes Roflumilast is a selective phosphodiesterase 4 (PDE4) inhibitor used for the treatment of chronic obstructive pulmonary disease (COPD). Roflumilast stable isotopes are non-radioactive isotopes of roflumilast, which are used in research and development studies to determine the pharmacokinetic and metabolic properties of the drug. These stable isotopes have the same chemical and physical properties as the natural element, but with a different number of neutrons in the nucleus. They can be used to trace the drug's pathway within the body, measure its concentration, and evaluate its efficacy and safety.