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76DESIGNER DRUGSFigure 7.2 China White powder, shown here, is a syntheticform of heroin that is very pure. China White that was taintedwith illegal fentanyl analogues, which are hundreds of timesmore potent than heroin, caused numerous overdoses in heroinaddicts in the late 1970s and early 1980s.Users of fentanyl analogues report that these drugs producea rapid “rush” or euphoria that is similar to that felt with heroin,followed by a sedated, dream-like state. As analgesics, they alsoproduce a profound loss of pain sensation and have commonunwanted side effects such as sleepiness and constipation.However, because they are so potent, fentanyl analogues can

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