By: Neda Gharani, PhD
Reviewed by: CPMC Genetic Counseling Staff

Codeine is an opioid analgesic (pain medication) used to treat mild to moderately severe pain. Codeine may also be used to control a cough or diarrhea. Codeine's pain relieving properties result mainly from its conversion (metabolism) to the opiate morphine. Morphine has about 10 times greater pain relieving effect than codeine, but codeine and morphine have about equal effect on cough suppression. Codeine is available as a single-ingredient product (such as codeine sulfate), in combination with acetaminophen (such as Tylenol 3), with ibuprofen (such as Nurofen plus), with aspirin, and as an ingredient in some cough and cold medications.

Learn more about codeine and understand your likely response to this drug through the links below.

Uses of Codeine

Learn more about the uses of codeine.
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Risk Factors

Both genetic and non-genetic factors affect how your body processes codeine.
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The CPMC Study

Learn how the CPMC Study identifies your response to codeine.
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Reduce Your Risk

Reduce your risk for an undesired response to codeine Learn More› ]