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Heroin Addiction and Related Clinical Problems: 2026, 28: 161-170

The Fentanyl Analogue Outbreak in Sweden, 2016–2018: Lessons Learned

Bodil Monwell

Digital Object Identifier:
https://doi.org/10.62401/2531-4122-2026-19

Summary: Background: Highly potent synthetic opioids, particularly fentanyl and its analogues, have been increasingly implicated in fatal overdoses and frequently appear on illicit markets as novel psychoactive substances (NPS) designed to evade regulatory controls. In Sweden, drug poisoning deaths involving fentanyl analogues emerged during a “cluster outbreak” 2015–2018. Methods: This register-based study include 7,408 individuals who died from psychoactive substance poisoning in Sweden 2012- 2020. Individual-level data from the forensic registers were linked to national health-, prescription-, and demographic registers. Results: The 2015–2018 fentanyl analogue cluster outbreak disproportionately affected younger men and often involved polysubstance use. Nearly half of them have had contact with health care for substance use disorder in proximal time. The overdoses frequently occurred in emergency units or in private residence settings. Discussion/Conclusion: The results needed to be discussed out of the contextual frame in Sweden during this years to understand the cluster outbreak. During 2016-2018 the problem with fentanyl-analogues was heightened media and political attention which accelerated regulatory classification of new psycho active substances, strengthened law enforcement, and peer-driven risk communication on drug related sites at internet helped to contain the outbreak. These findings highlight the importance of identifying risk-groups, coordinated, multi-level preventive strategies to mitigate harms from emerging synthetic opioids.

Keywords: Opioids; Fentanyl Analogues; Novel Psychoactive Substances; Poisioning deaths; Drug Related Death