Emodepside is an anthelmintic drug that is effective against a number of gastrointestinal nematodes, is licensed for use in cats and belongs to the class of drugs known as the octadepsipeptides, a relatively new class of anthelmintic (research into these compounds began in the early 1990s), which are suspected to achieve their anti-parasitic effect by a novel mechanism of action due to their ability to kill nematodes resistant to other anthelmintics.