Narcotic antitussives
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Opioid
An opioid is a chemical that works by binding to opioid receptors, which are found principally in the central nervous system and the gastrointestinal tract. The receptors in these two organ systems mediate both the beneficial effects and the side effects of opioids. The analgesic (pain relieving)... -
Narcotic analgesics
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Antitussives