This video is for clinicians to give a brief overview of the key neurotransmitters identified in common substances used and their action. The information contained within this video was taken from: Queensland Brain Institute. What are Neurotransmitters? [Internet]; 2017; cited 2019 27 June].Available from: https://qbi.uq.edu.au/brain/brain-physiology/what-are-neurotransmitters. NIDA. Impacts of drugs on neurotransmission [Internet]; 2017; cited 2019 21 March].Available from:https://www.drugabuse.gov/longdesc/impacts-drugs-neurotransmission McCoy AN, Tan SY. Otto Loewi (1873-1961): Dreamer and Nobel laureate. Singapore medical journal. 2014;55(1):3-4. doi: 10.11622/smedj.2014002