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fentanyl

Man-made drugs that mimic the effects of natural opioids (such as opium or heroin). Most synthetic opioids are class A drugs which means they're illegal to have for yourself, give away or sell.
As with natural opiates, the effects of synthetic opioids include:
pain relief
euphoria or well-being
relaxation
sleepiness
User have also reported sweating, itching and nausea.