Opiate withdrawal is an acute state caused by cessation or dramatic reduction of use of opiate drugs that has been heavy and prolonged (several weeks or longer). Opiates include heroin, morphine, codeine, Oxycontin, Dilaudid, methadone, and others. The reaction frequently includes sweating, shaking, headache, drug craving, nausea, vomiting, abdominal cramping, diarrhea, inability to sleep ...
The difference between opioid and opiate is that opioid is a broad term used to describe any type of substance, either natural or man-made (synthetic) that binds to opioid receptors in the brain (these control pain, pleasurable, and addictive behaviors). Opioids include natural substances, such as codeine, morphine, and heroin; synthetic substances such as fentanyl and methadone; and semi ...
Opiate receptors are found throughout the body and impart functions such as pain relief, sedation, respiratory depression (slowed or halted breathing), and physical dependence. Buprenorphine is used at higher doses for opioid-use disorder while generally at lower doses to treat moderate to severe pain.
Bottom Line Naltrexone is a full opiate receptor antagonist and works by binding primarily at the mu opioid receptors. By binding to these receptors, it blocks the euphoric (pleasurable or "high") effects associated with alcohol use or opioids.