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Originally Posted by Hemogoblin Being tired may be normal as opiates have that side effect. Just as a side note for anyone interested but roughly 10% of the population (namely white Europeans I believe) can't metabolize codeine into morphine which is the active metabolite. That's why for some people, taking a Tylenol 3 does nothing with regards to opiate pain relief.
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Tylenol 3 is simply Tylenol with Codeine. The small amount of Codeine present in it makes hit a schedule III controlled substance....hence the three.
Codeine is not Morphine. Yes, they both stimulate opioid receptors, but are not the same thing. Codeine Stimulates opiate receptors in the CNS; also causes respiratory depression, peripheral vasodilation, inhibition of intestinal peristalsis, stimulation of the chemoreceptors that cause vomiting, increased bladder tone, and suppression of cough reflex.
Just thought I would clear that up.