Codeine

:For the rock band of this name see Codeine (band).

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Codeine (INN) is an opioid used for its analgesic, antitussive and antidiarrheal properties. It is commonly marketed as the phosphate salt codeine phosphate.

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Codeine is an alkaloid found in opium in concentrations ranging from 0.7 to 2.5 percent. While codeine can be extracted from opium, most codeine used in the United States is synthesized from morphine through the process of O-methylation.

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INN: :For the river named Inn, see Inn River....

Opioid: An opioid is any agent that binds to opioid receptors found principally in the central nervous system and gastrointestinal tract. There are four broad classes of opioids: endogenous opioid peptides, produced in the body; opium alkaloids, such as morphine (the prototypical opioid) and codeine; semi-s...

Analgesic: An analgesic (colloquially known as painkiller) is any member of the diverse group of drugs used to relieve pain and to achieve analgesia (literally, "absence of pain"). Analgesic drugs act in various ways on the peripheral and central nervous system; they include paracetamol (acetaminophen), the no...