Edifolone (SC-35135) is a structurally unique class Ia antiarrhythmic agent. It acts as a sodium channel antagonist. Edifolone development has been discontinued.

Mozenavir is a non-peptidomimetic, water soluble, cyclic urea that is a selective inhibitor of HIV-1 protease. Mozenavir is active against the virus with the signature D30N nelfinavir resistance-associated mutation and the L90M mutants with decreased susceptibility to a number of other protease inhibitors. In a dose-ranging study assessing Mozenavir, in doses of 750 mg 3 times a day, 1250 mg twice daily, or 1250 mg 3 times a day, compared with standard doses of indinavir, both in combination with lamivudine and stavudine, plasma HIV-1 RNA levels were reduced to below 50 copies/mL in 75% to 80% of patients receiving Mozenavir-based treatment and in 70% of those receiving indinavir-based treatment. Mozenavir-based regimens were generally well tolerated. However, the virus was able to mount considerable resistance against this compound, which was not further developed, also because of poor oral bioavailability in humans and highly variable blood levels.

Astra Hässle (now Hässle Läkemedel, a subsidiary of AstraZeneca) of Sweden was developing an IV formulation of almokalant for use in the treatment of atrial arrhythmias. Almokalant is a selective blocker of the delayed outward K+ current. Almokalant exhibited properties of a selective class III antiarrhythmic agent, devoid of β-blocking activity, in vitro and in vivo, in animals and humans. In humans, prolongation of the refractoriness of the atria and ventricles has been demonstrated, as well as a prolongation of the ventricular repolarization. A moderate antiarrhythmic efficacy has been disclosed in studies in patients with supraventricular reciprocating tachycardias, with atrial fibrillation and with premature ventricular contractions. Almokalant also has proarrhythmic potential and thedevelopment of almokalant was discontinued due to induction of Torsade de Pointes, which occurred in some susceptible patients during the clinical trials.

Monatepil is a calcium antagonist that, as do existing calcium antagonists, inhibits the influx of extracellular Ca 2 + through voltage-dependent Ca 2 + channels. It is a new type of antihypertensive agent. Its unique chemical structure was specially designed with intrinsic calcium antagonist and a1 -adrenoceptor-blocking moieties, creating a dual mechanism of action. Positive effects on plasma lipid metabolism are derived from the a1 -adrenoceptor-blocking activity and the antiatherosclerotic effect derives from the calcium antagonist properties. The novel structure of monatepil produces a slow onset of action and a long-lasting antihypertensive effect in experimental animals.

Clibucaine is a piperidine derivative possessing local anesthetic properties and used in the clinic as a local anesthetic in the 1980s.

Citenazone (Hoe 105) is an antiviral compound, developed in the 1970s by Hoechst. It is claimed to have activity for vaccinia infection in mice, baby rats, and rabbits, and for variola infection in baby mice.

Sinefungin, a natural nucleoside isolated from cultures of Streptomyces incarnatus and S. griseolus, is structurally related to S-adenosylhomocysteine and S-adenosylmethionine. Sinefungin is a DNA methyltransferase (DNMT) inhibitor (IC₅₀ = 0.1 - 20 uM). Sinefungin has been shown to inhibit the development of various fungi and viruses, but its major attraction to date resides in its potent antiparasitic activity. This compound has been reported to display antiparasitic activity against malarial, trypanosomal, and leishmanial species. Sinefungin inhibits pneumococcal biofilm growth in vitro and colonization in vivo, decreases AI-2 production, and downregulates luxS, pfs, and speE gene expressions. Sinefungin was significantly suppressive against both L. donovani and L. braziliensis panamensis infections in hamsters when compared with meglumine antimonate. An immunosuppressed rat model was used to investigate the anti-Cryptosporidium parvum activity of sinefungin. In infected animals, oral sinefungin therapy resulted in a dose-related suppression of oocyst shedding, which correlated with oocyst disappearance from ileal sections. When administered prior to or on the day of oocyst challenge, sinefungin successfully prevented infection. These data suggest that sinefungin could be considered as a candidate molecule in the treatment of human cryptosporidiosis, considered to be the most significant enteric opportunistic infection in AIDS.

BMS-908662 (previously known as XL281) is a small molecule Raf kinase inhibitor that lies immediately downstream of RAS and are key components of the RAS/RAF/MEK/ERK kinase-signaling pathway. Bristol-Myers Squibb has received an exclusive worldwide license to develop and commercialize antineoplastic agent XL281. BMS-908662 participated in phase I development for the treatment of patients with melanoma and in combination with cetuximab for patients with colorectal cancer. However, further, development has been discontinued.

LANEPITANT is a selective nonpeptide antagonist for the neurokinin-1 receptor. It inhibits neurogenic dural inflammation. LANEPITANT was under development as a potential analgesic drug for the treatment of migraine, arthritis and diabetic neuropathy. However, it failed to show sufficient efficacy to support further development.