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Opioids are a class of drugs that include both natural and synthetic substances derived from the opium poppy or chemically synthesized to mimic their effects. They are primarily used medically for pain relief but are also associated with high potential for misuse and addiction. Common opioids include morphine, heroin, codeine, fentanyl, oxycodone, and hydrocodone. These substances act on opioid receptors in ______ _______ _________ __________ ____ ______ _____.
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