Codeine: 7 things you should know - Drugs.com
https://www.drugs.com/tips/codeine-patient-tips
WEBJul 5, 2023 · 1. How it works. Codeine is an opioid analgesic (pain reliever) that is related to morphine. Codeine works by weakly binding to a specific opioid receptor, known as the mu-opioid receptor, but with much less affinity than morphine, which means its analgesic (pain-relieving effects) are much less.
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