Background and Objective: Monkey tail is a sieved mixture of alcohol (Ogogoro) and marijuana (Cannabis sativa). It is prepared by brewing the leaves, roots, stem, or seeds of marijuana in Ogogoro for a few days or more. Monkey tail is heavily patronized for euphoric, medicinal and intoxicating purposes without empirical data. The study was designed to identify the chemical composition of monkey tail to over whether it is toxic, therapeutic, or mixed. Materials and Methods: Ten samples of monkey tail bought from ten different vendors were analyzed for heavy metals and other bioactive compounds using Atomic Absorption Spectrophotometry (AAS) and gas chromatography (GC), respectively. Results: The findings revealed an increase in mean concentrations of cadmium and lead, whereas chromium concentration is decreased in monkey tail when compared to WHO permissible limits. In a similar vein, eighteen bioactive ingredients with varying concentrations were also observed in a chromatogram. Three of the eighteen compounds observed constituted about 60%. They include dichloroacetic which constitutes 27.536%, methylene chloride 16.285% and derivative of trimethyl 14.081%. Conclusion: Some of the compounds discovered are therapeutic, whereas others were toxic. In conclusion, monkey tail could be described as a mixture that is either toxic or therapeutic.