Codeine also known as 3-methylmorphine, is an opioid pain reliever used to treat mild to moderately severe pain. It is also used, usually in combination with other medications, to reduce coughing. Codeine is available as a single-ingredient product, or in combination with acetaminophen or aspirin, and in some cough and cold medications.

3-methylmorphine,works directly on opioid receptors in the central nervous system and reduces feelings of pain by interrupting the way nerves signal pain between the brain and the body.

It also suppresses the activity in the brain that controls coughing.

• Codeine is an opioid pain-relief medicine used for the short-term relief of mild to moderate pain.
• It is not usually recommended for the treatment of chronic (long-term) pain.
• 3-methylmorphine, is only available on prescription from your doctor.
• If you stop taking codeine suddenly, you may experience withdrawal symptoms.