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Can Buprenorphine Be Overdosed? The Ceiling Effect and Its Clinical Implications
Rozalia Beata Kozińska1, Julia Ślęzak1, Ignacy Ilski1
1Scientific Society for Psychopharmacology, Department of Forensic Medicine, Wroclaw Medical University, Mikulicza-Radeckiego 4J, 50-345 Wroclaw, Poland.
Pharmaceuticals (Basel, Switzerland)
|June 26, 2026
Summary
Buprenorphine, a partial opioid agonist, has a ceiling effect reducing overdose risk but is not risk-free. Fatal overdoses can occur, especially with polysubstance use or in vulnerable populations.
Area of Science:
- Pharmacology
- Toxicology
- Public Health
Background:
- Opioid-related mortality is a critical global health issue, mainly due to respiratory depression from full μ-opioid receptor agonists.
- Buprenorphine, a partial μ-opioid receptor agonist, has a ceiling effect on respiratory depression and euphoria, offering a potential safety advantage.
- Its use in opioid replacement therapy and pain management is recognized, but its safety profile, particularly regarding fatal overdose, requires thorough evaluation.
Purpose of the Study:
- To evaluate if buprenorphine can cause fatal overdose despite its ceiling effect.
- To examine cases of buprenorphine-related fatalities.
- To synthesize current data on buprenorphine's safety profile in various contexts.
Main Methods:
- Narrative review synthesizing data from pre-clinical, clinical, pharmacological, and toxicological studies.
- Analysis of existing literature on buprenorphine's pharmacological properties and reported fatalities.
- Evaluation of factors contributing to buprenorphine-related adverse events.
Main Results:
- The ceiling effect on respiratory depression does not entirely eliminate the risk of fatal overdose.
- Polysubstance use, especially with other central nervous system depressants, significantly increases the risk of buprenorphine-related fatalities.
- Buprenorphine's safety is compromised in vulnerable populations like opioid-naive individuals, children, and those with respiratory issues.
Conclusions:
- While buprenorphine presents a lower fatality risk than full opioid agonists, it is not risk-free.
- The protective benefits of the ceiling effect are context-dependent and not absolute.
- Buprenorphine-related deaths are often associated with polysubstance use, highlighting the importance of comprehensive risk assessment.
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