Enciprazine also known as WY-48624 or, D-3112 is a GABA A receptor agonist which was in the phase III of clinical trial for the treatment of anxiety disorders. Enciprazine was well tolerated, with low levels of sedative and asthenic side effects reported. However, research was discontinued.

Alemcinal (ABT-229), a 12-deoxymotilide, is a potent motilin agonist stereoselectively designed by Abbott researchers as an orally active gastroprokinetic agent. ABT-229 is selective agonist of the motilin receptor. ABT-229 is a synthetic derivative of erythromycin with no antibiotic activity, it has been shown to bind to motilin receptors and stimulate contractile activity of the antrum and small intestine. However, the development of Alemcinal was discontinued.

Lotrifen is a non-hormonal abortifacient agent. It is used in veterinary. Lotrifen causes the arrest and involution of pregnancy. It acts, after the implantation of the blastocyst, directly on the product of conception, which undergoes a slow and gradual degenerative process and ends with the reabsorption or expulsion of it.

Hepzidine (BS 7051) is a compound, possessing antidepressive and anticholinergic properties.

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.

Estrazinol is a synthetic estrogen.

Oxitriptyline, a tricyclic antidepressant that has never been marketed

Antineoplaston A10 is a piperidinedione antineoplaston with potential antineoplastic activity. Antineoplaston A10 was originally isolated from human urine but is now synthetically derived. This agent intercalates into DNA, resulting in cell cycle arrest in G1 phase, reduction of mitosis, and decreased protein synthesis. Antineoplaston A10 may also inhibit ras-oncogene expression and activate tumor suppressor gene p53, leading to cell differentiation and apoptosis. Antineoplaston A10 has been used in trials studying the treatment of glioma, sarcoma, lymphoma, lung cancer, liver cancer, and kidney cancer, among others.