Enadoline (CI-977) is a potent and selective agonist at the kappa-opioid receptor. Enadoline is a potent antinociceptive agent. Clinical use of enadoline was associated with dose-limiting neuropsychiatric adverse events. Enadoline may yet find some application against ischaemic stroke and severe head injury, presumably in comatose patients.

Berupipam (also known as NNC 22-0010), a dopamine antagonist with a high affinity and selectivity for D1 receptor has been studied for patients with psychotic disorders. Berupipam participated in phase I clinical trials; however, further development of this drug was discontinued

Cefdaloxime is a third-generation cephalosporin antibiotic patented by pharmaceutical company Roussel-UCLAF. Cefdaloxime activity was the poorest among the different oral cephalosporins.

FLORTANIDAZOLE F-18 is a radioactive tumor hypoxia tracer to potentially identify and quantify the degree of hypoxia in tumors in vivo via positron emission tomography (PET) imaging.

Cogazocine is an opioid analgesic of the benzomorphan family, invented by the Dutch company ACF Chemiedfarma N.V. The compound was active in a tail withdrawal and writhing tests in rats and possessed nalorphine-like activity in rats after an intravenous dose of 0.04 mg/kg.

Desomorphine is the common name for 4,5--epoxy-17- methylmorphinan-3-ol or dihydrodesoxymorphine-D. It is an opioid analogue and morphine derivative in which the 6-hydroxyl group and the double bond at carbons 7 and 8 of morphine are reduced. Desomorphine can cross the blood–brain barrier, binding to opioid receptors, similar to the pharmacokinetic distribution of all phenanthrene-structured alkaloids. Taking Desomorphine causes euphoria as well as sedative and analgesic relief. In addition to its faster onset than other powerful painkillers drugs such as morphine, desomorphine also initiates less sedative effects and seems to have favorable postoperative results, such as reduced need for catheterization, less dizziness, and decreased vomiting incidence. In comparison with Morphine, Desomorphine is faster reduced. It follows that it has to be taken it more frequently to get the same effects. Furthermore, it causes side effects such as respiratory and gastrointestinal problems and increased blood pressure. In addition, Desomorphine’s withdrawal symptoms are up to three times longer than Morphine’s. This leads to the conclusion that Desomorphine is more addictive. At present, desomorphine is classified as a narcotic drug (DEA code number 9055) in Schedule I of the U.S. Controlled Substances Act and is listed as a controlled substance under the international Single Convention on Narcotic Drugs of 1961.

Romergoline (FCE 23884) is an ergoline derivative and a dopamine receptor agonist and antagonist. Its action depends on the functional state of the biological substrate, mostly related to the presence or absence of dopamine. In healthy animals, it behaves as a full dopamine antagonist, but in denervated models it behaves as an agonist. Therefore, romergoline was suggested to be potentially useful in both psychotic states and extrapyramidal diseases. In Parkinson patients, the degree of dopamine receptor stimulation was found to be insufficient to improve symptoms. Information about further development of romergoline is not available.

Cicloprolol is a beta-adrenoceptor antagonist patented by French pharmaceutical company Synthelabo S. A. for treatment of heart disorders. Cicloprolol has a weak beta-agonistic effect at normal levels of adrenergic discharge and acts as an antagonist at high levels of discharge. In clinical trials, Cicloprolol did not affect resting heart rate and blood pressure, but it reduced significantly peak exercise heart rate and peak rate-pressure product. The effect was especially significant in patients with sinus rhythm. The drug did not induce bradycardia or arrhyth- mias. Resting and exercise ejection rate were not affected. Cicloprolol improved the quality of life and the work capacity of 40% of patients with congestive failure due to ischemic etiology. Side effects were few and similar to placebo and cicloprolol.

Cloxotestosterone (17β-chloral hemiacetal testosterone) is a synthetic anabolic-androgenic steroid, discovered by Leo Pharmaceutical. The androgenic activity of cloxotestosterone in the rat tests was three to four times that of testosterone propionate.