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A new synthetic opioid as powerful as fentanyl is causing overdose deaths at an ever-increasing rate, experts warn. What's worse, the designer drug is legal in most places in the U.S. Isotonitazene — commonly referred to as "iso" — is causing around 40 to 50 overdose deaths a month in the U.S., compared with about six per month last summer, said Dr. Antonio De Filippo, an addiction specialist and medical director at Delphi Behavioral Health Group in Fort Lauderdale, Florida.
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