IPROFENIN is an iminodiacetic acid derivative. Its 99mTc radiolabelled form was used in cholescintigraphy and hepatobiliary scintigraphy to diagnose problems of the liver, gallbladder and bile ducts.

Lesogaberan is a peripherally restricted high-affinity GABAB-R-specific agonist, originally developed for the treatment of gastroesophageal reflux disease (GERD) that appears to be safe for human use. The toxicity profile shows no indication of hepatic effect. Lesogaberan has been shown to induce decreased body weight and decreased food consumption. A dose-dependent diuretic effect was also noted in rats. Treatment with lesogaberan significantly enhanced replication of human islet cells in vitro, which was abrogated by a GABAB-R antagonist. Lesogaberan may be a promising drug candidate for clinical studies of diabetes intervention and islet transplantation. Disappointingly, in phase IIb study it was shown that lesogaberan is only marginally superior to placebo in gastroesophageal reflux disease (GERD) patients who are partially responsive to proton pump inhibitor (PPI) therapy.

Propoxate (R7464) is a potent anesthetic agent in cold-blooded vertebrates, which has never been marked and has never been used on humans.

Carotegrast is phenylalanine derivative patented by pharmaceutical company Ajinomoto Co. for the treatment or prevention of inflammatory disease states related to the α4 integrin-dependent adhesion process. In preclinical studies, Carotegrast shows pharmacological activity in rheumatoid arthritis and inflammatory bowel disease.

Isoxepac (also known) as HP-549 is a non-steroidal anti-inflammatory drug with analgesic activity. Isoxepac was studied in the clinical trial for the treatment of postoperative pain after knee surgery for meniscectomy. It was shown, that 200 mg of isoxepac would appear to be the minimal effective dose. In case of rheumatoid arthritis, isoxepac showed significantly fewer adverse effects.

Becampanel (AMP397) is an aminomethylquinoxalinedione AMPA receptor antagonist. Also, AMP397 demonstrates binding to hydroxyapatite. AMP397 has no genotoxic potential in vivo. In particular, no genotoxic metabolite is formed in mammalian cells, and, if formed by intestinal bacteria, is unable to exert any genotoxic activity in the adjacent intestinal tissue. AMP397 has a significant oral bioavailability of 22% in mice and approximately 50% in humans. It was under development for the potential treatment of status epilepticus and other types of seizures. However, this research has been discontinued. It is also being evaluated for use in the treatment of neuropathic pain and cerebrovascular ischemia.

Idrapril is an inhibitor of the angiotensin-converting enzyme the last is responsible for recurrent myocardial infarction in patients with left ventricular dysfunction. Idrapril participated in phase II clinical trials in essential hypertensive patients, where was shown that the drug was well tolerated. In addition, it was involved in preclinical studies as a potential drug to treat heart failure and postmyocardial infarction. However, the development of the drug was discontinued.

Merafloxacin (CI 934) is a quinolone antibacterial. It is an inhibitor of Type II DNA topoisomerase. It demonstrated excellent activity against gram-positive organisms, including Corynebacterium sp. In addition, although the activity of merafloxacin against gram-negative bacilli was less than that reported for similar agents, it was comparable to that of aminoglycosidic aminocyclitol antibiotics. Merafloxacin development has been discontinued.

Adarotene (ST1926) is a new pro-apoptotic and cytodifferentiating antitumour drug, belongs to the so-called class of atypical retinoids. Adarotene is active on its own or in combination with other chemotherapeutics for the treatment of a vast number of experimental tumors. It was found in preclinical investigations the potential therapeutic use it in chronic myeloid leukemia (CML), against Rhabdomyosarcoma and for treatment of Adult T-cell leukemia/lymphoma (ATL). ST1926 induced an early DNA damage response, which led to increase in apoptosis, in addition to S-phase cell cycle arrest and a reduction in protein levels of the cell cycle kinase CDK1. The presence of the phenolic hydroxyl group on adarotene structure allows a rapid O-glucuronidation as a major mechanism of elimination of the drug, favoring a fast excretion of its glucuronide metabolite in the urines.

British Biotech was developing solimastat [BB 3644], an inhibitor of tumour necrosis factor and matrix metalloproteinase, as a potential treatment for colorectal cancer, inflammatory bowel diseases and rheumatoid arthritis. BB-3644 is an oral, broad-spectrum matrix metalloproteinase inhibitor (MMPI) structurally related to marimastat and BB-94. It is also >10-fold more active than marimastat in inhibiting the processing of cell-bound TNF-alpha. Solimastat development has been discontinued due to significant musculoskeletal toxicity.