可待因 (Ascomp, Cheratussin, Cheratussin Dac +27)

概览

Codeine is an opioid analgesic used to treat moderate to severe pain when the use of an opioid is indicated.

作用机制

Although the exact mechanism of action of codeine is still unknown, it is generally thought to be mediated through the agonism of opioid receptors, particularly the mu-opioid receptors. Morphine was previously postulated to contribute to the analgesic effect of codeine due to the O-demethylation of codeine to morphine by CYP2D6. Particularly, CYP2D6 poor metabolizer did not experience the analgesic effect of codeine. However, this is unlikely to be the main mechanism of action of codeine as only 5% of codeine is metabolized to morphine. Other hypotheses also postulate that codeine-6-glucuronide, the main metabolite of codeine, mediates the analgesic effect of codeine as it not only has an affinity to the mu receptors as codeine but also can be metabolized to morphine-6-glucuronide, which was observed to be more potent than morphine. Binding to the mu receptors by codeine activates the G-proteins Gα, causing a decrease in intracellular cAMP and Ca level. This causes hyperpolarization of nociceptive neurons, thus imparing the transmission of pain signals.

适应症

Codeine sulfate is a form of this drug that is commonly used. It is available in tablet form and indicated for the relief of mild to moderately severe pain, where the use of an opioid analgesic is appropriate . The solution form is used by itself or combined in a syrup with other drugs and is used as a cough suppressant in adults aged 18 and above , .

• Common Cold
• Cough
• Flu caused by Influenza
• Mild pain
• Pain
• Severe Pain
• Dry cough
• Moderate Pain
• Upper respiratory symptoms