Oxdralazine is a peripheral vasodilator that was studied for patients with severe essential hypertension. The clinical trial has shown that at the end of the third month 25 patients on the triple regimen (chlorthalidone plus oxdralazine plus propranolol) achieved a stable diastolic blood pressure of 90 mm Hg or less. However, information about the further development of this drug is not available.

Davasaicin is a synthetic derivative of capsaicin, developed at the Korea Research Institute of Chemical Technology. Davasaicin possesses very potent analgesic activity, demonstrated in several animal models, such as phenylbenzoquinone-induced writhing test, tail-flick test in mice and adjuvant arthritic flexion test in rats. When administered topically, davasaicin has an antipruritic effect in the mouse model.

Darglitazone is a member of the thiazolidinedione class of drugs and an agonist of peroxisome proliferator-activated receptor-γ (PPAR-γ), an orphan member of the nuclear receptor superfamily of transcription factors. It has a variety of insulin-sensitizing effects, such as improving glycemic and lipidemic control, and is used in the treatment of metabolic disorders such as type II diabetes. Darglitazone sodium had been in phase I clinical trials by Pfizer for the treatment of type 2 diabetes. However, this study has been discontinued.

Crolibulin is a tubulin-disrupting agent, interacting at the colchicine-binding site, developed by EpiCept Corporation (which was later acquired by Immune Pharmaceuticals). The compound exhibits anti-cancer effect by vascular disruption and inhibition of apoptosis. In preclinical animal tumor models, combination therapy with crolibulin has demonstrated the synergistic activity with cytotoxic drugs as well as anti-angiogenic drugs, such as Avastin. The drug was investigated in clinical trials for the treatment of anaplastic thyroid cancer and has demonstrated a positive effect.

Cormethasone is a topical antiinflammatory corticosteroid discovered by Du Pont.

Cloquinozine is a quinazoline derivative discovered by Japanese company Chugai Pharmaceutical in the 1960s. Cloquinozine has oxytocic properties and induces uterine contractions when administered to rabbits intravenously at 1 mg/kg.

Clonazoline is an imidazoline sympathomimetic, an alpha-adrenoreceptor agonist. It was used as a nasal decongestant and vasoconstrictor. The drug was marketed in Italy in combination with Fluocinolone under tradename Localyn.

Clometherone is an investigational derivative of progesterone, possessing antiestrogen and antiandrogen activities. It was developed by Eli Lilly in the 1960s and was found to significantly suppress the estrone induced uterine hypertrophy in mice at an oral or subcutaneous dose of 10ug. In a clinical trial, administration of clometherone to adult males lead to a slight increase in sebum production.

Otenabant (CP-945,598) is Pfizer developed as a potent and selective cannabinoid receptor CB1 antagonist with Ki of 0.7 nM, which exhibits 10,000-fold greater selectivity against human CB2 receptor, for treatment of obesity. In clinical trial III Pfizer decided to discontinue the development program based on changing regulatory perspectives on the risk/benefit profile of the CB1 class and likely new regulatory requirements for approval.