Question explored with the scientific record
Is bisoprolol safer than other b blockers in overdosage
The short version: bisoprolol looks less dangerous than propranolol or sotalol in overdose, but no study here directly compares it to every other beta-blocker.
The best evidence is a poison-center review of 2,967 beta-blocker exposures. In single-drug overdoses there were no deaths at all [1]. That is the key fact: most beta-blocker overdoses, taken alone, survive with supportive care. The danger is concentrated in specific drugs and in mixed overdoses.
Propranolol is the standout hazard. It caused seizures and carried higher death risk than other beta-blockers in overdose [2], and case reports describe fatal massive ingestions despite maximal therapy [3]. Sotalol is the other outlier: it caused asystole (the heart stopping) after a 6.72 g overdose [4]. Bisoprolol, by contrast, showed a dose-response where symptoms only worsened at higher doses, and no single-drug fatality appeared in the review [1].
| Drug | Overdose signal in these records |
|---|---|
| Bisoprolol | No single-drug deaths; symptoms rose with dose [1] |
| Propranolol | Seizures, higher death risk, fatal cases [2][3] |
| Sotalol | Asystole reported [4] |
| Metoprolol | Linear dose-response, no single-drug deaths [1] |
One caveat: the only fatality tied to bisoprolol in these records was a mixed overdose with verapamil [1]. Mixing drugs is where beta-blocker overdose turns lethal, regardless of which one you took.
My call: bisoprolol appears safer than propranolol and sotalol in overdose, but the evidence is observational poison-center data, not a head-to-head trial. Confidence: moderate.
Sources used 4
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Clinical toxicology of beta‐blocker overdose in adults
This retrospective study of 2,967 beta-blocker exposure cases reported to the Mainz Poison Center over 2001–2011 compared toxicity across beta-blockers by beta-1 selectivity and by dose, including co-exposures with other antihypertensives, and found no fatalities in single-subst…
DOI: 10.1111/bcpt.13231 -
Relative Toxicity of Beta Blockers in Overdose
This study investigates the relative toxicity of various beta blockers in overdose situations, highlighting that propranolol is associated with higher risks of seizures and death compared to other beta blockers.
DOI: 10.3109/15563659609013789 -
A Fatal Case of Propranolol Poisoning
This case report documents a fatal massive overdose of propranolol hydrochloride in an 18-year-old man, detailing the clinical course, hemodynamic findings of markedly reduced systemic vascular resistance with preserved cardiac output, and discussion of potential alpha-blockade …
DOI: 10.1177/106002808802201009 -
Sotalol poisoning associated with asystole
This case report describes a 70-year-old woman who experienced asystole following a sotalol overdose of 6.72 g, highlighting the unique risks associated with sotalol poisoning compared to other beta-blockers.
DOI: 10.1007/bf01709280