Nalorphine is a synthetic opioid antagonist that is used medically to reverse the effects of opioids such as morphine. It is also used in testing for opioid addiction or dependence. Synonyms for nalorphine include Nalline, Lethidrone, and N-Cyclobutylmethyl-14-hydroxydihydronormorphinone. Nalline is a brand name for nalorphine and is commonly used in the U.S. It is important to note that nalorphine is not commonly used for the treatment of opioid addiction due to its short duration of action and potential for side effects. However, it can be a useful tool in certain situations such as overdose or testing.