Ecgonidine, also known as methyl ecgonidine, is a psychoactive alkaloid that is closely related to cocaine. There are several synonyms for this substance, including benzoylecgonine methyl ester, cocaine pyrolysis product, 2-(benzoylethyl)-3-methyl-4-quinazolinone, and norcocaethylene. Ecgonidine is formed as a metabolite of cocaine in the body and has been used as a biomarker to detect cocaine use. It has also been studied for its potential as a pharmacotherapy for cocaine addiction. The development of new synonyms that more accurately describe ecgonidine's properties and uses may become more relevant as research into its potential as a treatment continues to progress.