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.

Esmirtazapine (S-(+)mirtazapine or ORG-50081) is an enantiomer of mirtazapine (REMERON®), a high-affinity antagonist at 5-HT2/5-HT3 and H1 receptors, used in the treatment of depression. Esmirtazapine has a shorter plasma half-life than the R(−) enantiomer. Esmirtazapine is preferentially metabolized into an 8-hydroxy glucuronide. Organon was developing esmirtazapine for the treatment of hot flushes (vasomotor symptoms) associated with the menopause and insomnia.

Sivifene (also known as A-007), a triaryl hydrazone that produced objective responses when applied topically. During preclinical studies, sivifene was observed to upregulate both cutaneous and systemic T-lymphocytes, in particular, CD4/8+ lymphocyte subtypes. The current mechanism of action for the drug is unknown however is assumed that it can show its immunomodulating properties through the upregulation of the CD45 T lymphocyte cell surface receptor. Sivifene was being evaluated for its anticancer activities in melanoma, breast cancer, Kaposi's sarcoma, and lymphoproliferative disorders. The drug as a 0.25% gel is confirmed as an effective palliative treatment option for cutaneous metastases from cancers. Skin reactions were minimal, tolerated, and no cessation of treatment was required. However, the further development of this drug apparently has been discontinued.

Pexacerfont is a highly potent and selective CRF1 receptor antagonist that displays no agonist properties. It is specific for CRF1 receptors and has more than 1,000- fold less affinity for CRF2 receptors, and more than 100- fold less affinity for the CRF-binding protein. In extensive preclinical studies, pexacerfont has been shown to inhibit specific binding of CRF to rat, dog, monkey, and human CRF1 receptors. The functional anxiolytic effects of CRF1 receptor occupancy were demonstrated in two rodent models of anxiety, situational anxiety and elevated plus maze paradigms. Pexacerfont did not demonstrate efficacy compared to placebo for the treatment of generalized anxiety disorder in human. The bogus taste tests suggested some protective effect of pexacerfont against eating after a laboratory stressor. Pexacerfont had been in phase II clinical trials for the treatment of irritable bowel syndrome and depression depression.

Linsitinib is an inhibitor of the insulin receptor and the insulin-like growth factor 1 receptor, which may result in the inhibition of tumor cell proliferation and the induction of tumor cell apoptosis. Linsitinib is in phase II clinical trials for the treatment of metastatic prostate carcinoma, gastrointestinal stromal tumors and other cancers. Common adverse events included fatigue, nausea hyperglycaemia and anorexia.

Pleuromulin (pleuromulitin) is a natural antibiotic isolated from Basidiomycete Pleurotus. Pleuromulitin exhibits activity mainly against gram-positive bacteria including S. aureus, Klebasiella pneumoniae and Bacillus Subtilis. Pleuromulin is an organic compound which is not reported to be used in as a drug however its derivatives have been used in treatment of infections. The first pleuromulitin that was approved in 1979 for use in veterinary medicine was semi-synthetic derivative tiamulin. Semisynthetic pleuromutilin retapamulin (ALTABAX, GlaxoSmithKline) was the first approved for topical use in humans in 2007. Another derivative of pleuromulin, Lefamulin has been successfully tested in phase 1 clinical trial for systemic use in patients (Nabriva Therapeutics AG).

Benolizime is a sedative and hypnotic drug but was never marketed.

Pyroxamine (also known as AHR 224) is benzhydryl ethers of 3-pyrrolidinol patented by A. H. Robins Co., Inc. as antihistamine with bronchodilation activity. In preclinical studies, Pyroxamine shows moderate inhibition of histamine-induced ulceration in guinea pigs

Imanixil (also known as HOE-402) was developed as a potent cholesterol-lowering compound, which inhibits VLDL production, and consequently attenuates atherosclerosis development. This drug participated in phase I clinical trial for the treatment of hyperlipidemia, however, this study was discontinued.