TD 8954 (also known as TAK 954) is a selective serotonin 5-HT(4) receptor agonist. It is known a potential role for potent and efficacious 5-HT(4) receptor agonists in the treatment of Alzheimer's disease (AD). TD 8954 participated in phase I clinical trials to study its potential role in the treatment of AD. However, this study was discontinued. In addition, TD 8954 is involved in phase II clinical trials to investigate its effect on gastrointestinal and colonic transit in diabetic or idiopathic gastroparesis participants and for the prophylaxis and treatment of postoperative gastrointestinal dysfunction in participants undergoing large- and small-bowel resection.

ITRIGLUMIDE, an anthranilic acid derivative, is a cholecystokinin B receptor antagonist.

Meturedepa (also known as AB-132), an alkylating agent that was developed as an antineoplastic drug. Meturedepa was studied to treat lymphomas and leukemias. The drug also participated in the Eastern clinical drug evaluation program for 233 patients with advanced cancer. Information about the current use of this compound is not available.

Bamirastine (previously known as TAK 427), an antiallergic compound that inhibits ligand binding to recombinant human histamine H1 receptor. The drug was involved in phase II clinical trials for the treatment of allergic rhinitis and for patients with atopic dermatitis. However, these studies were discontinued.

Exisulind (tentative trade name Aptosyn) is an antineoplastic agent, which was originally developed by Cell Pathways. This drug is an inhibitor of phosphodiesterase (PDE) isozymes: PDE5 and PDE4. Inhibition of PDE5 appears to be pharmacologically relevant, which leads to increase cGMP and activate protein kinase G at doses that induce apoptosis, whereas cyclic AMP levels were not changed. Exisulind has been in phase III clinical trials for the treatment of Non-Small Cell Lung Cancer and for the treatment of polyps in patients who have familial adenomatous polyposis (Colorectal Cancer and Small Intestine Cancer). In addition, this drug was in phase II/III for the treatment of Prostate Cancer, however, there studies have been discontinued.

Morphine-6-glucuronide is a pharmacologically active metabolite of morphine that is being developed by CeNeS Pharmaceuticals as an alternative to morphine for the management of postoperative pain. Compared to morphine, Morphine-6-glucuronide has been reported to have6 and 86 times lower affinity for the human mu and kappa opioid receptors, respectively, and similar affinity for the delta opioid receptor. Morphine-6-glucuronide is was studied in phase III clinical trials for postoperative pain management. Unfortunately, Morphine-6-glucuronide failed to demonstrate superior safety compared to Morphine and further development was discontinued. Morphine-6-glucuronide accumulates after administration of morphine to patients with renal insufficiency, and analgesia can be obtained with lower doses of morphine compared to patients with normal renal function. More importantly, the dose should be reduced to avoid serious side-effects, although the simulations in this review did not account for side-effects.

Darglitazone is a member of the thiazolidinedione class of drugs and an agonist of peroxisome proliferator-activated receptor-γ (PPAR-γ), an orphan member of the nuclear receptor superfamily of transcription factors. It has a variety of insulin-sensitizing effects, such as improving glycemic and lipidemic control, and is used in the treatment of metabolic disorders such as type II diabetes. Darglitazone sodium had been in phase I clinical trials by Pfizer for the treatment of type 2 diabetes. However, this study has been discontinued.