Displaying 5 results of Ramelteon Stable Isotopes Ramelteon Stable Isotopes are non-radioactive forms of the drug Ramelteon, which is used to treat sleep disorders such as insomnia. The stable isotopes of Ramelteon can be used in research and clinical studies to track the drug's metabolism and distribution in the body. These isotopes are chemically identical to the naturally occurring form of Ramelteon, but have different atomic structures that allow for precise tracking and analysis.