The past decade has seen tremendous growth in the study of cannabinoid receptor signaling in brain. The impact and consequences of cannabinoid modulation of monoaminergic (dopamine, norepinephrine, and serotonin) circuits is becoming more clear. Scientists have shown significant interaction between these two systems in a variety of psychiatric and neurological disorders such as affective disorders, multiple sclerosis, and pain or pain disorders. The overarching goal of is to provide current information on advances in the field of endocannabinoid signaling and potential therapeutic applications with a particular emphasis on monoaminergic circuits. ​