Furacrinic acid (also known as GP 48 674) was studied as a diuretic agent and participated in clinical trials. However, information about the further development of this drug is not available.

Pirmagrel is the selective thromboxane synthetase inhibitor. The compound was well tolerated by all subjects without evidence of any adverse reactions. Serum thromboxane B2 levels (the stable metabolic product of thromboxane A2) were significantly reduced after administration of the compound, with the maximal effect of a 99 per cent reduction occurring at 0.5 and 1 hour after administration. Bleeding times showed a slight increase 2 hours after administration of the compound. Pirmagrel was able to completely prevent the increase in serum thromboxane B2 following allergen challenge in asthmatic patients; while it caused a very small reduction in the early response to allergen, there was no effect on the late response or on airway hyperresponsiveness. Pirmagrel was developed for the treatment of ischemic heart disorders and thrombosis. However, this development was discontinued.

Sodium arsenate as-74 (As74) has been the principal positron-emitting scanning agent. As74 as a commercial preparation for parenteral adminitration was made available towards the end of 1956. From March 1957 all studies were made with sodium arsenate rather than sodium arsenite. Sodium arsenate as-74 was used in the diagnosis of suvatentorial brain tumours. Traces of the element were found in all body tissues, and assays of injected As74 recovered in brain tumours showed highest values in meningiomas, followed, in order, by gliolastomas, metastatic carcinomas and astrocytomas.

Meteneprost (9-deoxo-16, 16-dimethyl-9-methylene PGE2) is a prostaglandin E2 analog. It exerts uterine-stimulating potency: meteneprost is able to both stimulate uterine contractions and dilate the cervical canal. It was studied as an abortifacient in early pregnancy.

GV 150526A (gavestinel) is an investigational drug for a neuroprotective therapy of acute ischemic stroke within 6 hours of symptom onset. It is a potent and selective non-competitive antagonist at the glycine site of the N-methyl-D-aspartate receptor (NMDA) which reduces infarct volume in experimental stroke models. Gavestinel acts at the strychnine-insensitive glycine binding site of the NMDA receptor-channel complex with nanomolar affinity (pKi = 8.5), coupled with high glutamate receptor selectivity. Gavestinel displays higher than 1000-fold selectivity over NMDA, AMPA and kainate binding sites and is orally bioavailable and active in vivo. GV 150526A inhibited convulsions induced by NMDA in mice, when administered by both IV and po routes (ED50 = 0.06 and 6 mg/kg, respectively). The safety and efficacy of GV150526 were studied in two phase III randomized placebo-controlled clinical trials of acute ischemic stroke patients within 6 h from onset [The Glycine Antagonist in Neuroprotection (GAIN) International and GAIN Americas Trials] sponsored by GlaxoSmithKline. The results of these trials suggested that gavestinel was not of substantial benefit or harm to patients with primary intracerebral hemorrhage.

Oximonam (also known as SQ 82,291) was developed as a monobactam antibiotic that had shown good activity against different bacteria of the family Enterobacteriaceae and Haemophilus influenzae and was no activity at all against staphylococci and against Pseudomonas aeruginosa.

MK-0533 is a novel selective peroxisome proliferator-activated receptor gamma modulator for the treatment of type 2 diabetes mellitus. In comparison with PPARγ full agonists, MK-0533 displayed diminished maximal activity (partial agonism) in cell-based transcription activation assays and attenuated gene signatures in adipose tissue. MK-0533 exhibited comparable efficacy to rosiglitazone and pioglitazone in vivo. However, with regard to the induction of untoward events, MK-0533 displayed no cardiac hypertrophy, attenuated increases in brown adipose tissue, minimal increases in plasma volume, and no increases in extracellular fluid volume in vivo. MK-0533 was teste in phase II clinical trials but future development was discontinued.

Tecarfarin (also known as ATI-5923), an anticoagulant, is a vitamin K reductase antagonist. Tecarfarin is participating in phase III clinical trials for the treatment of thromboembolism and thrombosis. On March 11, 2019, Espero BioPharma Inc. announced that the U.S. Food and Drug Administration (FDA) has granted Orphan Drug Designation (ODD) for tecarfarin for the prevention of systemic thromboembolism of cardiac origin. Tecarfarin is metabolized by esterases, escaping metabolism by the cytochrome P450 system and thereby avoiding cytochrome P450-mediated drug-drug or drug-food interactions as well as genetic variations found in the cytochrome P450 system.

Eprotirome (KB2115) is a thyroid hormone mimetic developed at Karo Bio AB (Huddinge, Sweden). Eprotirome has a 22-fold higher affinity for thyroid hormone receptor (TR)β in comparison with TRα. It lowers plasma LDL cholesterol and stimulates bile acid synthesis. Eprotirome can lower LDL cholesterol concentrations in patients with familial hypercholesterolaemia when added to conventional statin treatment with or without ezetimibe, but that it has the potential to induce liver injury. These findings, along with findings of cartilage damage in dogs, raise serious doubts about selective thyroid hormone mimetics as a therapeutic approach to lower LDL cholesterol concentrations. Eprotirome development was discontinued.

Cicloprofen is fluorene derivative patented by American pharmaceutical company E. R. Squibb as anti-inflammatory agents. Cicloprofen is potent cyclooxygenase inhibitor. Cicloprofen undergoes hydroxylation of the fluorene rings and conjugation with glucuronic acid or sulfate and metabolic transformation leading to stereospecific inversion of the ( - )-enantiomer of Cicloprofen to its (+)-antipode