Abstract
Butorphanol (Stadol(R) - injectable as tartrate salt), Levo-N-cyclo-butylmethyl-6-10αβ-dihydroxy 1,2,3,9,10,10a-hexahydro-(4H)-10, 4a-imino-ethanophenanthroline is a narcotic agonist-antagonist and a potent analgesic drug with pronounced pharmacological activity similar to morphine and meperidine(1–10).