Causes
Opioids produce a quick, intense feeling of pleasure (euphoria), followed by a sense of well-being and calm drowsiness. When opioids are used repeatedly, your brain is likely to become dependent on them. Opioids are a highly addictive type of drug.
Chemical Release in Brain
Opioids stimulate the release of "euphoric" chemicals in the brain. Over time, more drug is required to produce the same release, leading to opioid abuse.
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