## Most Common Opioid Causing Poisoning Deaths in India **Key Point:** Heroin (diacetylmorphine) is the most common opioid responsible for poisoning deaths in India, particularly in urban centres and among substance abusers. ### Epidemiology of Opioid Poisoning in India **High-Yield:** Heroin accounts for the majority of opioid-related deaths due to: - High abuse potential and rapid onset of action - Illicit availability and uncontrolled dosing - Frequent co-ingestion with other CNS depressants (alcohol, benzodiazepines) - Respiratory depression leading to hypoxemia and death ### Clinical Features of Opioid Poisoning | Feature | Mechanism | |---------|----------| | Pinpoint pupils | μ-receptor agonism in midbrain | | Respiratory depression | Depression of respiratory centres in medulla | | Loss of consciousness | CNS depression | | Pulmonary edema | Increased capillary permeability | | Bradycardia | Vagal stimulation | ### Management **Clinical Pearl:** Naloxone is the antidote of choice for opioid poisoning. It is a competitive μ-receptor antagonist with rapid onset (2–3 minutes IV) and short half-life (30–90 minutes), necessitating repeated doses or continuous infusion. ### Why Heroin is Most Common 1. **Illicit availability** — widespread in drug trafficking networks 2. **Rapid CNS penetration** — diacetyl groups enhance lipophilicity 3. **High potency** — 2–3 times more potent than morphine 4. **Abuse liability** — euphoria and rapid onset encourage repeated use 5. **Uncontrolled dosing** — street heroin has variable purity, increasing overdose risk **Mnemonic: HEROIN DEATHS — High potency, Euphoria, Rapid onset, Opioid receptor agonism, Illicit availability, Neurodegeneration risk** [cite:KD Tripathi 8e Ch 41]
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