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Present the Pharmacology of Opioids, Including Chemical Changes and Mechanism of Action Chance Peterson 11/1/2013 SOS-304 W.A. 5 Question 1 1.1 Present the pharmacology of opioids, including chemical changes and mechanism of action. Opioids, such as morphine, codeine and heroin can be derived from raw opium and generally consist of carbon, oxygen and nitrogen. Acetyl.