They are administered either orally (tablets, capsules …) or intravenously, depending on the intensity of symptoms. Emetic emein comes from the Greek meaning “vomit”. They are antagonists of neurotransmitters. They will somehow stimulate the vomiting center, located in the medulla oblongata. Clearly, they act on the brain nerve centers that control the vomiting. They may also act by relaxing the muscles of the lower stomach.