Wiktionary
profadol
n. An opioid analgesic.
Wikipedia
Profadol
Profadol (CI-572) is an opioid analgesic which was developed in the 1960s by Parke-Davis. It acts as a mixed agonist- antagonist of the μ-opioid receptor. The analgetic potency is about the same as of pethidine (meperidine), the antagonistic effect is 1/50 of nalorphine.