Dexindoprofen is a non-steroidal drug that has analgesic and anti-inflammatory properties. Dexindoprofen is the dextrorotatory stereo-isomer of indoprofen, to which it has a similar adverse effect pattern. Gastrointestinal and nervous system effects and skin reactions are the most frequent. Following reports of severe gastrointestinal bleeding and carcinogenicity in animals indoprofen was withdrawn from the market worldwide.

Ebselen is a small molecule mimic and inducer of glutathione peroxidase activity and possesses antioxidant and anti-inflammatory properties. This drug has been investigated in phase II clinical trials for the treatment of Meniere's disease, bipolar disorder and in the prevention of hearing loss. Besides, experiments on mice have shown that ZIKV infection could be on the list for potential use of ebselen. It alleviates testicular pathology in mice with Zika virus infection and prevents its sexual transmission. Ebselen has various mechanisms of action. It binds to the N-terminal domain of soluble epoxide hydrolase and chemically reacts with the enzyme to quickly and irreversibly inhibit one of the enzymes' activity: phosphatase (Nterm-phos). Besides, ebselen inhibits inositol monophosphatase and thus exhibits lithium-like on human central nervous system (CNS) function. In addition, ebselen inhibits the G4 isoform of acetylcholinesterase. It is a well-known relationship between the cholinergic system and learning, memory and other common cognitive processes, thus ebselen can be studied for the treatment of memory impairment diseases.

Etersalate is a derivative of aspirin exerting antiplatelet, analgesic, anti-inflammatory and antipyretic properties. Etersalate has potential to prevent oligomerization of amyloid beta (Aβ) peptides.

Meseclazone (W-2395) is a non-steroidal anti-inflammatory drug. It exerts anti-inflammatory, analgesic and antipyretic activity. Meseclazone inhibits in vitro and ex vivo platelet aggregation initiated by the release reaction. It inhibits bradykinin-induced bronchospasm.

Ruzadolane (previously known as UP 26-91) is a serotonin receptor antagonist that was developed as a non-narcotic, centrally acting analgesic agent for the treatment of anxiety disorder and pain. However, these studies were discontinued.

Pamicogrel is a cyclooxygenase inhibitor with platelet anti-aggregatory properties which is under development by Kanebo for chronic arterial occlusion. It also has potential in both prophylaxis and treatment of ischemic brain injury. An NDA was submitted in Japan in April 1997. The effects of the drug on platelet aggregation were originally disclosed in EP-00159677, while the later European patent, EP-00560136, claims its use in brain dysfunction induced by hypoxia arising from disturbance of cerebral circulation, such as cerebral hemorrhage or cerebral infarction.

Indantadol (previously known as CHF-3381) is an oral and noncompetitive N-methyl-D-aspartate (NMDA) receptor antagonist and reversible monoamine oxidase-A (MAO-A) inhibitor that is being developed by Vernalis plc, under license from Chiesi Farmaceutici SpA, for the potential treatment of neuropathic pain. In preclinical studies, indantadol exhibited neuroprotective effects after kainate-induced seizures and displayed anticonvulsant and antihyperalgesic activity. Indantadol also caused a dose-dependent decrease in exploratory motility. In a human heat-capsaicin-induced pain model, indantadol at a dose of 500 mg effectively reduced the area of secondary hyperalgesia. The tolerability profile of the drug at single doses up to 600 mg and twice-daily doses up to 400 mg in clinical trials was significantly more favorable than for other NMDA antagonists. Most side effects have been observed to be mild, and include dizziness and asthenia. Indantadol was in phase II clinical trials for the treatment of chronic cough and neuropathic pain. However, these studies had been discontinued.

Dibusadol is an analgesic agent.

Metacetamol (3-hydroxyacetanilide) is a structural isomer of the widely used drug paracetamol and is being considered as a promising alternative to the latter because of its lower toxicity. 3-hydroxyacetanilide, the positional isomer of paracetamol, does not cause depletion of GSH in vivo or hepatotoxicity even though the extent of covalent binding of the reactive metabolite (in vivo or in vitro) is comparable to that for an equimolar dose of paracetamol. Metacetamol should prove to be a useful tool to aid in the discrimination of hepatic acetaminophen protein adducts that may be critical or noncritical to survival of hepatocytes