Dizocilpine (MK-801) is an antagonist of the N-methyl-D-aspartate (NMDA) receptor in the glutamate category involved with the central nervous system (CNS). The drug displays a variety of physiological actions, many of which involve the CNS, such as anesthetic and anticonvulsant properties. It penetrates readily into CNS and was described as the agent with central sympathomimetic properties. Co-administration of dizocilpine with psychostimulants, such as cocaine, amphetamine and nicotine, has been reported to prevent the development of behavioural sensitization to these drugs as well as associated neuroadaptations in rodents. However, studies with bromocriptine have suggested that co-administration of dizocilpine might merely cause sensitization to become state-dependent. A single injection of MK-801 to rats models both positive and negative symptoms of schizophrenia. Treatment of mice with dizocilpine induced learning impairment.

Guanoctine was studied as an antihypertensive agent.

Sofinicline is a selective agonist of the a4b2 subtype of nAChR. It is under development by Abbott Laboratories in collaboration with NeuroSearch. It is produced as a capsule in doses of 1, 2 or 4 mg. Sofinicline is a full agonist of the a4b2 nAChR. It has high binding affinity, ~ 0.1 nM, for this receptor. Sofinicline is orally active and is metabolized hepatically. Sofinicline has been used in trials studying the treatment of ADHD, neuralgia, diabetic neuropathies, diabetic polyneuropathy, and diabetic neuropathic pain, among others.

Droclidinium is the muscarinic receptors antagonist. It is an anticholinergic, spasmolytic agent.

ABT-594 [(R)-5-(2-azetidinylmethoxy)-2-chloropyridine] is a potent cholinergic neuronal nicotinic acetylcholine receptor (nAChR) ligand with analgesic properties. ABT-594 binds alpha-4/ beta-2 neuronal nAChRs acting as an agonist. ABT-594 is studying for the treatment of diabetic peripheral neuropathic pain.

FIDUXOSIN is a selective alpha1-adrenoceptor antagonist with higher affinity for alpha1A-adrenoceptors and for alpha1D-adrenoceptors than for alpha1B-adrenoceptors. It was in clinical trials for the treatment of benign prostatic hyperplasia.

Prizidilol (also known as SKF 92657) is arylpyridazinylhydrazine derivative patented by Smith Kline and French Laboratories Ltd. as an antihypertensive agent. In clinical trials, Supine and standing blood pressure measured 24--27 h after drug intake was reduced Slight but significant decreases in heart rate were seen after moderate doses of prizidilol. A more pronounced blood pressure reduction was noticed 2--7 h after drug administration. Prizidilol was well tolerated, although dizziness and tiredness were reported by four patients and edema by two.

Sarafloxacin [A 55620] is a quinolone antibiotic that was under development with Abbott Laboratories in the USA. It was removed from clinical use by its manufacturer Abbott Laboratories from April 30, 2001. It was never approved for use in the US or Canada.

Carmegliptin is a potent, long-acting, selective, orally bioavailable, pyrrolidinone-based inhibitor of dipeptidyl peptidase 4 (DPP-4), with hypoglycemic activity. ). DPP-IV is a proline-specific serine protease enzyme that is known to rapidly inactivate two incretin hormones released during food ingestion, glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP). Incretins are essential for regulating both fasting and postprandial plasma glucose by stimulating insulin secretion, supporting β-cell mass, and inhibiting glucagon production by the α-cells to reduce glucose production by the liver. By selectively inhibiting DPP-IV, carmegliptin prolongs the activity of circulating GLP-1 and GIP and improves their potential to prolong the antidiabetic actions. Carmegliptin is indicated for use as monotherapy or in combination with other oral antihyperglycemic agents for the treatment of Type 2 diabetes.

Cevipabulin is a synthetic, water-soluble tubulin-binding agent with potential antineoplastic activity. Cevipabulin appears to bind at the vinca-binding site on tubulin but seems to act more similar to taxane-site binding agents in that it enhances tubulin polymerization and does not induce tubulin depolymerization. The disruption in microtubule dynamics may eventually inhibit cell division and reduce cellular growth.