FSM 25: Medicinal Poisons

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. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit drmanaankarray.substack.com/subscribe