ketazocine
Ketazocine is a synthetic opioid analgesic that belongs to the benzomorphan class of compounds. It was developed in the 1960s and has been investigated for its potential therapeutic uses. Ketazocine acts as a mixed agonist-antagonist at opioid receptors, meaning it can bind to and activate certain opioid receptors (agonist activity) while simultaneously blocking others (antagonist activity). Specifically, it exhibits kappa-opioid receptor agonism and mu-opioid receptor antagonism. This unique receptor profile is thought to contribute to its analgesic properties while potentially reducing some of the undesirable side effects associated with pure mu-opioid agonists, such as respiratory depression and dependence.
Pharmacological studies have shown that ketazocine possesses significant analgesic effects in preclinical models. Its mixed agonist-antagonist