Codeine is a member of the drug class opiates. Opiates include all naturally occurring drugs with morphine-like effects such as codeine and all semi and fully synthetic drugs with morphine-like effects such as heroin and meperidine (Demerol). Codeine was first discovered as a natural constituent of opium in very small concentrations, in the range of 0.7% - 2.5% by weight. Most codeine found in pharmaceutical products today is synthetically produced via the methylation of morphine.
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The effects will usually begin with a slight sedation, and a feeling of warmth coming over you body. Muscular relaxation is also quite noticeable. The subjective effects are quite hard to describe beyond the word euphoria. The sedation associated with codeine is quite a lot less than that experienced with morphine or other stronger opiates.
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This extraction method could be used on OTC products containing either acetaminophen or aspirin in addition to the codeine.