The definition of narcotics as pain modulating chemicals which cause insensibility and bind to opioid receptors started the class. The effects of narcotics was listed: analgesia, sedation, euphoria, cough suppression was listed, with a brief explanation of each.The pharmacology and physiology of pain management was discussed, by first recognizing the pathway by which pain is transmitted. Acute and chronic pain nerve fibers are different, acute being fast and chronic much slower. The production of endorphins as the signal passes into the brain stem modifies the pain, and the binding of opioids to the same receptors allows for greater pain relief. The perception of pain by the brain was stressed, as well as the pathway.