which drugs are opioids
Get the facts on the misuse and abuse of prescription opioids such as hydrocodone, oxycodone, morphine, and codeine, and the illegal opioid, heroin. Opioids are a class of drugs chemically similar to alkaloids found in opium poppies. Historically they have been used as painkillers, but they also have great potential for misuse. Repeated use of opioids greatly increases the risk of developing an opioid use disorder.