Nalorphine magani ne na antagonist na opioid wanda ake amfani dashi don juyar da tasirin magungunan opioid, kamar morphine da heroin. Yana aiki ta hanyar ɗaure ga masu karɓa iri ɗaya a cikin kwakwalwa waɗanda aka yi niyya ta opioids, amma nalorphine baya kunna waɗannan masu karɓa. Madadin haka, yana toshe tasirin opioids kuma yana iya haifar da alamun cirewa a cikin mutanen da suka dogara da jiki akan opioids. Tun da farko ana amfani da Nalorphine azaman maganin kashe radadi, amma yanzu ba kasafai ake amfani da shi don wannan dalili ba saboda ƙarancin ingancinsa da yuwuwar cin zarafi.