Opioid
psychoactive chemical
Opioids are a class of drugs that derive from, or mimic, natural substances found in the opium poppy plant. Opioids work on opioid receptors in the brain and other organs to produce a variety of morphine-like effects, including pain relief.
The terms opioid and opiate are sometimes used interchangeably, but the term opioid is often used to designate all substances, both natural and synthetic, that bind to opioid receptors in the brain, while the term opiate is often used to refer to alkaloid compounds naturally found in the opium poppy plant Papaver somniferum.
Medically they are primarily used for pain relief, including anesthesia. Other medical uses include suppression of diarrhea, replacement therapy for opioid use disorder, and suppressing cough. The opioid receptor antagonist naloxone is used to reverse opioid overdose. Extremely potent opioids such as carfentanil are approved only for veterinary use. Opioids are also frequently used recreationally for their euphoric effects or to prevent withdrawal. Opioids can be fatal, and have been used, alone and in combination, in a small number of executions in the United States.
Side effects of opioids may include itchiness, sedation, nausea, respiratory depression, constipation, and euphoria.
The public source identifies “Opioid” as psychoactive chemical. This brief keeps that definition visible, then builds a research path around Opioid, psychoactive and chemical.
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Stable identifiers, scientific names and standards terminology offer the best bridge between this overview and specialist evidence. The source revision retrieved here is dated Sep 22, 2026. The linked authority identifier is Q427523. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Opioid” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.