<unk> , also known as N-cyclopropylmethylnoroxymorphone, is a derivative of oxymorphone (14-hydroxydihydromorphinone). It is specifically the derivative of oxymorphone in which the tertiary amine methyl substituent is replaced with methylcyclopropane. Analogues The closely related medication, methylnaltrexone (N-methylnaltrexone), is used to treat opioid-induced constipation, but does not treat addiction as it does not cross the blood–brain barrier.<unk> mefene (6-desoxy-6-methylenenaltrexone) is similar to<unk>  and is used for the same purposes as<unk> .<unk>  should not be confused with<unk> oxone (N-allylnoroxymorphone), which is used in emergency cases of opioid overdose. Other opioid antagonists related to<unk>  include 6β-naltrexol (6β-hydroxynaltrexone), samidorphan (3-carboxamido-4-hydroxynaltrexone), β-funaltrexamine<unk>  fumarate methyl ester),<unk> odeine (N-allylnorcodeine),<unk> orphine (N-allylnormorphine), and<unk> buphine (N-cyclobutylmethyl-14-hydroxydihydronormorphine).
Naltrexone
Normethadone
Isomethadone
Methadone
Buprenorphine
Guanfacine
Nabilone
Atomoxetine