Ethylmethylthiambutene is a potent analgesic compatible with morphine. It possesses addiction liability similar to that of morphine.

Nitecapone (3-(3,4-dihydroxy-5-nitrobenzylidine)-2,4- pentanedione, OR-462) is a selective, short-acting catechol-O-methyltransferase (COMT) inhibitor, whose main site of action is in the gastrointestinal tract. Nitecapone displays in vivo activity in peripheral tissues but does not penetrate the blood-brain barrier. The compound increases mechanical and thermal nociception and reduces neuropathic pain in diabetic rats and in a spinal nerve ligation model. Nitecapone has been shown to have a protective effect against ischemia-reperfusion injury in experimental heart transplantation and in Langendorff preparations. Nitecapone added to cardioplegia solution reduces cardiac neutrophil accumulation and transcoronary neutrophil activation during clinical cardiopulmonary bypass. Reflected by better left ventricular stroke volume, nitecapone treatment may be an additional way of reducing the deleterious effects of neutrophil activation during cardiopulmonary bypass. Nitecapone was patented as an antiparkinsonian agent but was never marketed.

Mespiperone C-11 (3-N-[11C] methylspiperone) is a radiolabeled 3-N-methylspiperone. 3-N-methylspiperone is high-affinity D2/3 dopamine and 5-HT2A serotonin receptor antagonist. It has been studied as a positron emission tomography (PET) tracer for imaging D2/3 and 5HT2A receptor densities.

Milveterol (also known as GSK159797) was developed as a longer-acting beta2 adrenoceptor agonist for the treatment of respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD). Milveterol completed phase II clinical trials for asthmatic subjects. However further development of the drug was discontinued.

Mebiquine is an antidiarrheal and antihelmintic compound.

Elopiprazole [DU 29894 or 1-(7-benzofuranyl)-4-[[5-(4-fluorophenyl)-1-H-pyrrol-2yl]methyl]piperazine) is an antagonist at dopamine D2 and D3 receptors and an agonist at serotonin1A receptors. Elopiprazole development for the treatment of psychotic disorders has been discontinued.

Manifaxine (GW 320659) is a highly selective neuronal norepinephrine and dopamine re-uptake inhibitor. It has been in phase II clinical trials by GlaxoSmithKline for the treatment of attention deficit hyperactivity disorder and obesity. Manifaxine development has been discontinued.

Enestebol is an anabolic steroid.

Metribolone, also known as methyltrienolone, an anabolic agent, binds to the androgen receptor and was studied for the treatment of advanced breast cancer. However, because of the liver toxicity, further development of this drug was discontinued. Now, this compound is used for research purpose as synthetic androgen.

Fluazuron (N-[[4-chloro-3-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]oxyphenyl]carbamoyl]-2,6-difluorobenzamide, trade name Acatak) is an insect growth regulator belonging to the class of benzoyl phenyl urea derivatives, a class of chitin synthesis inhibitors. Fluazuron specifically interferes with chitin formation in ticks during engorgement, molt, and hatching. The substance is intended for tick control in beef cattle applied topically as a pour-on for use at single dose levels of 1.5 and 2.5 mg/kg BW with a possible additional treatment after 3 to 6 months.