# Regular Users Can Tolerate Previously ‘Unsurvivable’ Amounts of Fentanyl

- Published: 2026-07-02T09:01:23Z
- Updated: 2026-07-07T10:57:29Z
- Section: Health
- Language: English (en)
- Source: The New York Times — https://www.nytimes.com/2026/07/02/health/fentanyl-opioid-research-los-angeles.html
- Tags: The New York Times · Health
- Canonical: https://www.khabarestan.com/en/news/%DA%A9%D8%A7%D8%B1%D8%A8%D8%B1%D8%A7%D9%86-%D8%A7%D8%B9%D8%AA%DB%8C%D8%A7%D8%AF%D8%AF%D8%A7%D8%B1-%D9%81%D9%86%D8%AA%D8%A7%D9%86%DB%8C%D9%84-%D8%AF%D9%88%D8%B2%D9%87%D8%A7%DB%8C-%DA%A9%D8%B4%D9%86%D8%AF%D9%87-%D8%B1%D8%A7-%D8%A8%D8%AF%D9%88%D9%86-%D8%AE%D8%B7%D8%B1-%D9%85%DB%8C%D8%A8%D9%84%D8%B9%D9%86%D8%AF

New research shows that tolerance has become so strong that common treatments for opioid addiction are no longer effective for many patients.

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