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.
It is commonly prescribed because it is an effective analgesic as well as an effective pain reliever. Many studies have shown that properly managed medical use of Codeine is safe and rarely causes clinical addiction, which is defined as compulsive, often uncontrollable use.
Codeine can be used to manage pain effectively for a short period of time. Chronic use of Codeine can result in tolerance to the drug so that higher doses must be taken to obtain the same initial effects. Long-term use also can lead to physical dependence.
Codeine (INN) or methylmorphine is an opioid used for its analgesic, antitussive and antidiarrheal properties. It is marketed as the salts codeine sulfate and codeine phosphate.



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