2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) is a mutagenic and carcinogenic heterocyclic amine formed during ordinary cooking, and is subsequently metabolically activated by cytochrome P4501A2 (CYP1A2) and N-acetyltransferase 2 (NAT2). PhIP has been used in trials studying the basic science of Pancreas Cancer.

Methetoin, a neuropsychiatric agent possesses anticonvulsive properties. Information about the current use of this compound is not available.

Pranidipine is the calcium channel blocker. Pranidipine did not affect the sensitivity of the contractile proteins to calcium. Pranidipine also did not alter cyclic GMP-induced relaxation in alpha-toxin-skinned vascular preparations. Pranidipine also prolonged glyceryl trinitrate-induced relaxation in the endothelium denuded rat aorta. Pranidipine enhances cyclic GMP-independent NO-induced relaxation of smooth muscle by a mechanism other than through NO-induced hyperpolarization. These effects were in direct contrast to amlodipine, another new 1,4-dihydropyridine calcium antagonist. Pranidipine increased blood velocity and probably blood flow in the optic nerve head, choroid, and retina of rabbits. Pranidipine was not detrimental to global cardiac function in animals with dilated cardiomyopathy. Pranidipine enhances relaxation produced by endothelium-derived relaxing factor in carotid artery. Pranidipine was investigated as pharmacological agent for the treatment of angina pectoris and hypertension.

Igmesine is a sigma-1 receptor agonist. It was assayed in clinical trials targeting major depressive disorder. Igmesine is the only antisecretory agent that we have tested to date that inhibits both cholera toxin and the E. coli enterotoxins. Sigma receptors are known to be present on nerves in the enteric nervous system and this would seem to be a potentially useful class of drugs to pursue for the treatment of secretory diarrhoea in humans. It was shown that when Alzheimer's disease rats were submitted to the conditioned fear stress test, igmesine can significantly reduce the stress-induced motor suppression, indicating exogenous σ-1 receptor agonists may alleviate Alzheimer's disease-associated depressive symptoms.

Furaprofen (also known as R-803), a nonsteroidal drug possesses anti-inflammatory properties. This drug was studied for the treatment of rheumatoid arthritis. However, information about the further development of this drug is not available.

Dimepheptanol is one of the phenylpiperidine series, an opioid receptor agonist, which is active as an opioid analgesic. It is also elaborated in a number of close analogues, derivatives or diastereoisomers with similar properties. Dimepheptanol is a synthetic narcotic analgesic that has no accepted medical use in the United States.

Nafenodone [LU 39821] is a potent and selective inhibitor of norepinephrine and serotonin uptake. Its development for the treatment of anxiety disorders, major depressive disorder and psychotic disorders has been discontinued.