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Codeine

Known as: Morphinan-6-ol, 7,8-didehydro-4,5-epoxy-3-methoxy-17-methyl-, (5alpha,6alpha)-, morphine 3-methyl ether, N Methylmorphine 
A naturally occurring phenanthrene alkaloid and opioid agonist with analgesic, antidiarrheal and antitussive activities. Codeine mimics the actions… 
National Institutes of Health

Papers overview

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Review
2014
Review
2014
Codeine is bioactivated to morphine, a strong opioid agonist, by the hepatic cytochrome P450 2D6 (CYP2D6); hence, the efficacy… 
Review
2011
Review
2011
Highly Cited
2007
Highly Cited
2007
Codeine is an analgesic drug acting on μ-opiate receptors predominantly via its metabolite morphine, which is formed almost… 
Highly Cited
2004
Highly Cited
2004
Life-threatening opioid intoxication developed in a patient after he was given small doses of codeine for the treatment of a… 
Review
2002
Review
2002
Highly Cited
1975
Highly Cited
1975
The administration of single oral doses of delta‐9‐tetrahydrocannabinol (THC) to patients with cancer pain demonstrated a mild… 
Highly Cited
1972
Highly Cited
1972
Labeled morphine, codeine, heroin, or methadone was injected as a bolus into the common carotid artery of the rat, and the rat…