A relatively weak and long-lasting opiateNatural mind-altering compounds that are primarily prescribed for pain management. It either contains opium or has similar effects.. Due to these characteristics, it is used for opioidCompounds acting on opioid receptors in the body, whether naturally occurring or synthetic. Their use can lead to the development of crippling physical dependence. Whether used through a prescription for pain management or recreationally, its overuse in the United States has been classified as a nat... maintenance therapy, usually as a replacement for heroinAn opioid used as a recreational drug that is often injected. It has a euphoric effect on the user and is highly addictive both psychologically and physically. It is known for being one of the primary drugs involved in opioid overdoses and for its particularly nasty withdrawal symptoms.. It can also be used for chronic pain management.