Cleansing Your Bowel

{An opioid is a chemical substance that has a morphine-like action in the body|Chemical substance that has morphine-like action in the body is an opioid}. {Its main use is for pain relief|The main use is for the relief of pain}. {These agents work by binding to opioid receptors, which are found principally in the central nervous system and gastrointestinal tract|The way that they work is to bind opioid receptors that are found in th central nervous system and in the gastrointestinal tract}. {The receptors in these organ systems mediate both the beneficial effects and the undesirable side effects|The receptors for these organs will mediate the beneficial and the undesirable side effects}. {There are four classes narcotics:|The four classes to narcotics are:}