Meperidine, fentanyl, methadone, and propoxyphene are synthetic opioids. Codeine is the only opioid that has a morphine-related chemical structure that includes a 6-hydroxyl group. True allergic ...

But, he added, the rise in synthetic opioids follows a trend. “Unfortunately, the illicit drug trade over the past few years has made a … very seismic shift from semi-synthetic drugs ...

Federal agents busted a potent drug hub in South Florida that they say had the capability of manufacturing up to 250,000 counterfeit pills containing synthetic opioids such as fentanyl.