Dennis and Brad discuss the use of Nubain, also known as Bufene. Nubain is a non-controlled narcotic that was FDA-approved in 1979 and gained popularity in the 1980s and 1990s. It is similar in strength to morphine but lacks some of its side effects like respiratory depression. Nubain's unique properties include its ability to reverse itching caused by other narcotics and its use as an adjunct to ketamine or other pain management drugs. Dennis emphasizes the importance of monitoring respiratory rates and adjusting doses accordingly. Overall, Nubain is a valuable tool for managing pain in a field environment.