Enadoline is a drug which acts as a highly selective κ-opioidagonist.
In human studies, it produced visual distortions and feelings of dissociation, reminiscent of the effects of salvinorin A.[1]
It was studied as a potential analgesic, but abandoned because of the dose-limiting effects of dysphoria, which could be expected from a κ-opioid agonist. There was mention of its potential in treating comatose head injury or stroke victims, where that type of side effect would be immaterial.[2]
^Walsh SL, Strain EC, Abreu ME, Bigelow GE (September 2001). "Enadoline, a selective kappa opioid agonist: comparison with butorphanol and hydromorphone in humans". Psychopharmacology. 157 (2): 151–162. doi:10.1007/s002130100788. PMID11594439. S2CID10507758.
^Barber A, Gottschlich R (October 1997). "Novel developments with selective, non-peptidic kappa-opioid receptor agonists". Expert Opinion on Investigational Drugs. 6 (10): 1351–1368. doi:10.1517/13543784.6.10.1351. PMID15989506.