Levophenacylmorphan is the synthetic narcotic analgesic and sedative agent. Levophenacylmorphan have been used as pre-anaesthetic medication. Phenazocine and levophenacylmorphan have similar pharmacologic properties and similar analgesic potency. Levophenacylmorphan is under international control according to the UN Single Convention 1961 and its amendments. It is not found in any pharmaceutical preparations sold in the United States.

Levophenacylmorphan:
https://drugs.ncats.io/drug/7Q24AL2BR2

A morphinan derivative that acts as an opioid agonist. It has potent analgesic effects and is around 10x more potent than morphine.