NCIt definition : A naturally occurring phenanthrene alkaloid and opioid agonist with analgesic, antidiarrheal
and antitussive activities. Codeine mimics the actions of endogenous opioids by binding
to the opioid receptors at many sites within the central nervous system (CNS). Stimulation
of mu-subtype opioid receptors results in a decrease in the release of nociceptive
neurotransmitters such as substance P, GABA, dopamine, acetylcholine and noradrenaline;
in addition, the codeine metabolite morphine induces opening of G-protein-coupled
inwardly rectifying potassium (GIRK) channels and blocks the opening of N-type voltage-gated
calcium channels, resulting in hyperpolarization and reduced neuronal excitability.
Stimulation of gut mu-subtype opioid receptors results in a reduction in intestinal
motility and delayed intestinal transit times. Antitussive activity is mediated through
codeine's action on the cough center in the medulla.;
UNII : Q830PW7520;
InChIKey : WRRSFOZOETZUPG-FFHNEAJVSA-N;
CAS number : 6059-47-8; a href https://gsrs.ncats.nih.gov/ginas/app/beta/browse-substance?search 6059-47-8
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