Least sedative narcotic?

C i.e. Papaverine Papaverine is an opioid alkaloid with almost no central effectsQ (i.e. analgesia, sedation, euphoria, anxiolytic, addictive, respiratory depression). It does not suppress intestinal peristalsis, and relieves spasm in aeries. It is used to treat visceral (GI tract, bile duct, ureter) spasm, vasopasm of coronary & cerebral vessels and erectile dysfunction. It can also be used as smooth muscle relaxant in microsurgery, & cryopreservation of blood vessels and as a topical growth factor.