editorial use only .Tramadol painkiller drug. Person holding capsules of the analgesic (painkiller) drug tramadol (marketed as Zydol in the UK). This synthetic opioid is used to treat moderate to severe pain. It has a similar structure to codeine and binds to the body's opioid receptors, many of which are found in the central nervous system. Tramadol can be addictive. (KEYSTONE/SCIENCE PHOTO LIBRARY/DR P. MARAZZI/SCIENCE PHOTO LIBRARY)
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