Many substances designed to heal can harm when misused, miscalculated, or maliciously administered.

In this episode, we examine medicinal poisons - therapeutic agents that may become toxic in overdose, error, or deliberate ingestion. These cases often involve complex pharmacology, variable tolerance, and subtle pathological findings.

We explore:

* Paracetamol toxicity and delayed hepatic failure.

* Tricyclic antidepressants and cardiac conduction disturbance.

* Digoxin and arrhythmia.

* Insulin and hypoglycaemia.

* Anticoagulants and haemorrhagic complications.

* Drug interactions and cumulative toxicity.

* Therapeutic error versus intentional overdose.

* The role of prescription history in forensic interpretation.

A central principle emerges: dose determines harm. Therapeutic intent does not eliminate toxic potential. Interpretation must consider timing, co-morbidities, and delayed physiological effects.

We also address:

* Post-mortem drug redistribution.

* The difference between therapeutic, toxic, and fatal concentrations.

* Clinical presentation prior to death.

* The medico-legal phrasing of overdose findings.

* The importance of careful toxicological sampling.

Medicinal poisons blur the boundary between therapy and lethality - requiring meticulous analysis.

Key Takeaways

* Common medications may become fatal in overdose.

* Toxicity may be delayed, particularly in hepatic injury.

* Concentration ranges must be interpreted cautiously.

* Prescription access informs forensic context.

* Mixed ingestion complicates interpretation.

* Documentation must distinguish accident, self-harm, and error without speculation.

This episode highlights the forensic challenge of interpreting substances originally intended for healing.

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