Tylenol/Codeine #4 is a combination of a narcotic and acetaminophen used to relieve mild to moderate pain. Narcotic pain-relievers work by binding to opioid receptors in the brain and spinal cord, and acetaminophen decreases the formation of prostaglandins, therefore reducing pain. Tylenol/Codeine #4 may also be used to treat other conditions (e.g., cough) as determined by your doctor.
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