IRALUKAST, a leukotriene D4 analog, has potent peptido-leukotriene antagonist activity. It was under clinical development and in phase II clinical trials as a potential treatment for asthma.

13-deoxyadriamycin hydrochloride (13-Deoxydoxorubicin hydrochloride, GPX-100) is an anthracycline similar to doxorubicin. GPX-100 is unique among anthracyclines because it is not converted to doxorubicinol during metabolism in the body. This metabolite has been shown to be a major cause of damage to the heart (cardiotoxicity) in laboratory studies. GPX-100 belongs to the class of reactive oxygen species stimulants; RNA synthesis inhibitors and Type II DNA topoisomerase inhibitors. It was in phase II clinical trial for the treatment of cancer.

Eprociclovir (A5021, 9-[[cis-1', 2'-bis(hydroxymethyl)cycloprop-1'-yl]methyl]guanine) is a nucleoside analog with antiviral activity. Antiviral activity of eprociclovir appears to depend rapid and stable accumulation of its triphosphate in infected cells and on inhibition of viral DNA polymerase by its triphosphate. Eprociclovir was shown to be a potent inhibitor of the replication of herpes simplex virus type 1, 2, 6, Epstein-Barr virus and varicella zoster virus, both in vitro and in vivo. Eprociclovir development has been discontinued.

Retaspimycin (IPI-504) was previously under development by manufacturer Infinity Pharmaceuticals in conjunction with MedImmune, a part of AstraZeneca. Retaspimycin is a small-molecule inhibitor of heat shock protein 90 (HSP90) with antiproliferative and antineoplastic activities. Retaspimycin binds to and inhibits the cytosolic chaperone functions of HSP90, which maintains the stability and functional shape of many oncogenic signaling proteins and may be overexpressed or overactive in tumor cells. Retaspimycin-mediated inhibition of HSP90 promotes the proteasomal degradation of oncogenic signaling proteins in susceptible tumor cell populations, which may result in the induction of apoptosis. Orphan drug designation was assigned to the compound by the FDA for the treatment of gastrointestinal stromal cancer (GIST). Infinity Pharmaceuticals has discontinued the development of retaspimycin (IPI-504) an inhibitor of the HSP-90) complex, for the treatment of cancer due to lack of efficacy in 1913.

Elacridar is an oral bioenhancer that targets multiple drug resistance in tumors. Elacridar is a strong and relatively specific inhibitor of P-gp and BCRP, two main efflux transporters. Development of elacridar is assumed to have been discontinued.

Galdansetron is a selective serotonin antagonist compound that is effective against vomiting and nausea. This type of drug is used to treat motion sickness or side effects of chemotherapy or anesthetics.

Hycanthone is a thioxanthene derivative of lucanthone with anti-schistosomal activity and potential antineoplastic activity. It was clinically available for the treatment of human schistosomiasis. Anti-helmintic action relies on its ability to inhibit worm monoamine oxidase and cholinesterases. Hycanthone produced immediate side effects such as hepatotoxicity and gastrointestinal disturbances, and was consequently withdrawn. Hycanthone inhibits apurinic endonuclease-1 (APE1) by direct protein binding. Hycanthone was used in the 1980s as antitumor agents, it was pulled out of Phase II trials.

Aplaviroc (GW873140) is a small-molecule noncompetitive allosteric CCR5 antagonist or HIV entry inhibitor (EI) that binds specifically to human CCR5 and exhibits potent anti-HIV activity in vitro in the nanomolar or subnanomolar range. Aplaviroc has exhibited potent in vivo antiviral activity (1.66 log decrease in viral load at nadir) following 10 days of monotherapy. In vitro studies of antiviral activity demonstrate that aplaviroc is active against HIV isolates from a variety of clades as well as those resistant to current HIV therapies targeting RT, PR, and gp41. However, GlaxoSmithKline has decided to terminate Phase III trials of aplaviroc after encountering additional cases of liver damage in patients taking the drug.

Piquindone is an antipsychotic pyrroloisoquinoline derivative that binds to dopamine D2 receptors. It is a potent D-2 antagonist. It has a low potential for extrapyramidal effects and tardive dyskinesia. Piquindone exhibited relatively weaker cataleptogenic and antistereotypic activity than haloperidol, and had minimal activity in a rat chronic stereotypy model of receptor supersensitivity. Piquindone almost as potent as haloperidol, with fewer or less intense extrapyramidal effects and low potential for tardive dyskinesia. Piquindone led to moderate but significant improvements in the positive symptoms of schizophrenia and to improvements in negative symptoms just below the level of statistical significance. Therapeutic efficacy of a piquindone antagonist in Tourette Syndrome can be achieved without production of disabling extrapyramidal-side effects.

Dextrorphan is an active metabolite of dextromethorphan, is an antitussive agent, which was found in cough medicines. Dextrorphan is a noncompetitive N-methyl-D-aspartate receptor (NMDAR) antagonist, sigma 1 receptor agonist, so as is an agonist of mu and kappa opioid receptors. In addition was found, that dextrorphan possessed anticonvulsive and neuroprotective effects.