Ezlopitant (CJ-11974) is a non-peptide neurokinin-1 receptor antagonist. Pfizer was developing ezlopitant for the potential treatment of irritable bowel syndrome and chemotherapy-induced emesis. Development of ezlopitant has been discontinued.

Renzapride (BRL-24924) is a mixed 5-hydroxytryptamine type 4 (5-HT4) agonist and 5-HT3 receptor antagonist. This compound has a stimulatory effect on gastrointestinal motility and transit. Renzapride has been evaluated for use in treatment of irritable bowel syndrome (IBS). Data also suggested a potentially beneficial effect on abdominal pain/discomfort in women with constipation-predominant irritable bowel syndrome. Phase III clinical trials investigated if this drug could help alleviate the symptoms associated with this type of IBS. However, one phase III study has been terminated due to inefficient efficacy (compared to placebo).

Dapitant is an antagonist of neurokinin 1 (NK1) receptor, discovered by the French company Rhône-Poulenc Rorer. NK1 receptors are thought to mediate the neurogenic inflammatory effects of substance P. Dapitant demonstrated efficacy as an antimigraine agent in several animal models. However, in a global, double-blind, randomize, placebo-controlled trial in patients with migraine attacks with moderate or severe headache intensity, treatment with dapitant did not lead to an improvement in the intensity of headache, and the development of the drug was discontinued.

FLUDOREX is an antiemetic and anorexic agent.

Serlopitant, Originally developed by Merck, is a once-daily oral NK1 receptor antagonist being developed for the treatment of pruritus, or itch, associated with various conditions such as prurigo nodularis, psoriasis and chronic pruritus of unknown origin. It is highly selective for the human NK1 receptor and in both animal and human testing it has been well tolerated. In 2012, Merck licensed serlopitant to Menlo to develop it in indications other than nausea and vomiting. Development of serlopitant for the treatment of overactive bladder, alcohol dependence and pruritus was discontinued at phase II, by Merck & Co. and Japan. Menlo has completed three positive Phase 2 clinical trials with serlopitant showing a statistically significant reduction in pruritus compared to placebo. Serlopitant has been evaluated in over 1,600 patients and has been shown to be well-tolerated, including in patients who have received treatment for up to one year. Serlopitant is an investigational drug that is not currently approved for use in any indication in any country.

Pipramadol is an analgesic agent. Pipramadol exhibits not only antinociceptive but also central and peripheral antiserotonin properties.

Vofopitant (previously known as GR205171), a tetrazole-derivative, was developed as a neurokinin1 receptor antagonist. Vofopitant was studied in clinical trials phase II for the treatment of primary insomnia and posttraumatic stress disorder. However, these studies were discontinued due to lack of effectiveness. In addition, vofopitant participated in phase I for patients with bipolar disorder. However, this study was terminated because of the slow recruitment; trial unlikely to reach completion.

Levometiomeprazine is antiemetic, neuroleptic agent.

Alepride is a sulpiride derivative. It is an antiemetic agent.

Denipride is a gastrointestinal agent.