Abstract:The three opioid receptor subtypes, mu (µ), delta (δ) and kappa (κ) have long been associated with analgesia. Traditional opioid analgesics exert their effects through µ receptors located in the CNS. Recent studies suggest that the development of opioid analgesics displaying dual properties of µ agonism and δ antagonism could be of benefit by retaining potent analgesic properties while reducing the development of tolerance with chronic administration. UMB 425 displays high affinity at the µ receptor (K i = 3.2… Show more
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