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The reasons were either rapid delivery, analgesia refused, randomisation error or received meperidine (pethidine) or epidural respectively.
The class includes morphine, codeine, and a number of semi-synthetics including meperidine (Demerol), propoxyphen (Darvon), and others.
However, dextromethorphan should not be used in combination with narcotic analgesics such as meperidine or codeine, since dextromethorphan will increase the side effects of the analgesic.