Description
- The use of this substance can be described as:
- Codeine is used extensively to treat moderate to mild pain. Codeine is a weak μ agonist, but approximately 10% of an oral dose (30–60 mg) is metabolized to morphine, which contributes significantly to its analgesic effect. The plasma half-life of codeine after oral dose is 3.5 hours. The dose of codeine needed to produce analgesia after parenteral dose causes releases of histamine sufficient to produce hypotension, pruritus, and other allergic responses. Thus, administration of codeine by parenteral route is not recommended.
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