Denaverine is a benzilacid derivative. It is a phenobarbital-type microsomal enzyme inducer. Denaverine has a relaxing effect on the prepartum uterus and provides an increased flexibility of the soft birth canal. In addition, it has a surface anaestetic effect and an anticonvulsive effect as well as a slightly tranquilizing and antipyretic effect. In veterinary medicine denaverine hydrochloride is used to regulate myometrial contractions during parturition. It is a regularly used substance in obstetrics in veterinary medicine in many European countries.

Denipride is a gastrointestinal agent.

Cyclopregnol (neurosterone) is a synthetic pregnane steroid, developed in the 1950s by the British Drug Houses, Ltd, for the treatment of psychiatric disorders, such as anxiety, depression and obsessive behavior. In a clinical study, cyclopregnol was not superior to placebo and was inferior to chlorpromazine.

Cloxypendyl is an antipsychotic drug, invented in the 1960s by the Deutsche Gold und Silber-Scheideanstalt vormals Roessler. The compound was 3.5 times more effective than chlorpromazine in the mouse catalepsy test. No clinical and commercial development was reported.

Cotriptyline is a tricyclic antidepressant, discovered by French Societe Industrielle pour la Fabrication des Antibiotiques. The compound antagonized reserpine-induced ptosis and bradycardia in rodents and potentiated stereotyped behavior induced by administration of d-amphetamine.

Cipropride is an anti-emetic drug of the substituted benzamide class. It was discovered by Synthelabo in the early 1980s. The drug acts by blocking the dopamine receptor and thus affecting the chemo-receptor trigger zone for vomiting. Clinical trials showed that cipropride was effective for the prevention of nausea and vomiting induced by cytotoxic chemotherapy agents dacarbazine and Cis-platinum. The subsequent development of the drug was not reported.

Stilonium Iodide (also known as MG 624) is a trimethylethanaminium derivative with ganglionic-blocking action. Stilonium Iodide acts as α7-nicotinic receptor antagonist and Stilonium Iodide inhibits transmission between preganglionic and postganglionic neurons in the Autonomic Nervous System. Stilonium Iodide inhibits nicotine-induced proliferation and angiogenesis in human microvascular endothelial cells of the lung. Stilonium Iodide displayed anti-angiogenic activity in Matrigel, rat aortic ring and rat retinal explant assays. Furthermore, MG624 suppressed angiogenesis of NCI-H69 human SCLC tumors in vivo in both the chicken chorioallantoic membrane (CAM) and nude mice model.

Suxethonium is a depolarising muscle relaxant, with low incidence of postoperative muscle pain.

Quadazocine is a substituted hexahydro-2,6-methano-3-benzazocine patented by Sterling Drug Inc. as analgesics and narcotic antagonist. Quadazocine is a potent antagonist of μ opioid receptor, less potent antagonist of κ and δ opioid receptors. In monkeys for whom responding was reinforced by food delivery, quadazocine blocks the rate-decreasing effects of the µ-agonists alfentanil and fentanyl with greater potency than it blocked the rate-decreasing effects of the κ-agonists U69,593

Fanetizole is a derivative of 2-aminothiazole. It is an anti-inflammatory agent. This drug is reported to have some cyclooxygenase inhibiting activity. Production of superoxide in response to the chemotactic factor formyl-methionyl-leucyl-phenylalanine (f-Met-Leu-Phe) was markedly inhibited by fanetizole. Suppression of neutrophil production of toxic oxygen metabolites may partially explain the antiarthritic effect of fanetizole. Fanetizole was shown to restore depressed E-rosetting activity in adult thymectomized mice, as well as enhance in in vitro proliferation of murine thymic cells to mitogen and synergistically acted with the monokine interleukin-1. It displays anti-arthritic activity in viva in the rat adjuvant arthritis model, inhibiting the development of disease in the non-infected foot. This drug has less side effects than levamisole in animals.