<unk>  is an opioid analgesic drug used in scientific research.<unk>  is a selective antagonist for the nociceptin receptor, also known as the ORL-1 receptor. This was the fourth opioid receptor to be discovered, and is still the least understood. The noiciceptin receptor has complex effects which are involved in many processes to do with pain and inflammation, and activation of this receptor can either increase or reduce pain depending on dose. Drugs acting at the noiciceptin receptor may influence the effects of traditional analgesics including prostaglandin synthetase inhibitors such as NSAIDs, μ-opioid agonist drugs, and cannabinoids.<unk>  is an orally active drug that blocks the nociceptin receptor and produces analgesic effects in a variety of animal studies, and is particularly useful for neuropathic pain and allodynia associated with nerve injury.
JTC-801
Perhexiline
Dantron
Fendiline
Rivastigmine 
Rivastigmine
Rasagiline
Xantinol nicotinate