Displaying 1 results of Tasimelteon Stable Isotopes Tasimelteon is a medication used to treat sleep disorders like non-24-hour sleep-wake disorder. Stable isotopes of tasimelteon are non-radioactive forms of the molecule that have the same chemical and physical properties as the regular isotopes. These stable isotopes are used in research to study the metabolism, pharmacokinetics, and pharmacodynamics of the drug, and to develop new diagnostic tools and therapies for sleep disorders.