Displaying 2 results of Monepantel Stable Isotopes Monepantel Stable Isotopes are a form of isotopic labeling used in veterinary medicine. Monepantel is an anthelmintic drug used to control gastrointestinal nematodes in sheep and goats. Stable isotopes of monepantel are used to study drug metabolism, absorption, and excretion in animals. These isotopes are safe and do not affect the efficacy of the drug.