Datura
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I now have comprehensive information from multiple authoritative sources. Here is a complete overview:
Datura (Jimson Weed / Thorn Apple / Angel's Trumpet)
Taxonomy & Botanical Features
Datura belongs to the family Solanaceae and includes several medically significant species:
- Datura stramonium (Jimson weed) - most common worldwide; grows in temperate climates and, in India, on roadside wastelands
- Datura fastuosa (Datura alba / Datura niger) - common in India; associated with Lord Shiva (called Shivashekhar)
- Datura candida (Angel's trumpet)
- Datura suaveolens, Datura metal, Datura atrox
Plant characteristics: Broad green leaves resembling brinjal; bell-shaped flowers (white or deep purple); spherical fruit with sharp spines - hence "Thorn Apple." Seeds are brownish-black, bitter, and can be mistaken for capsicum seeds (chilli seeds are smaller and pinkish by comparison).
All parts of the plant are poisonous, but fruits and seeds contain the highest alkaloid concentrations.
Active Principles (Tropane Alkaloids)
| Alkaloid | Notes |
|---|---|
| Hyoscyamine | Primary active component; found in young stems and leaves |
| Hyoscine (Scopolamine) | Found in capsules and stems |
| Atropine | Largely a racemic artifact of hyoscyamine extraction; atropine (up to 0.426%) found in leaves |
Mechanism: Competitive blockade of acetylcholine at peripheral and central muscarinic receptors (anticholinergic effect). - The Essentials of Forensic Medicine and Toxicology, 36th ed.
Signs and Symptoms
Classic Mnemonic (Anticholinergic Toxidrome)
"Hot as a hare, Blind as a bat, Dry as a bone, Red as a beet, Mad as a hen"
The "10 D's" of Datura Poisoning
- Dryness of mouth (with nausea, vomiting)
- Dysphagia (difficulty swallowing/talking)
- Dilated pupils (mydriasis, photophobia, blurred vision, diplopia)
- Dry hot skin (temperature may rise to 107-108°F / ~42°C)
- Drunken gait (incoordination, staggering)
- Delirium (confusion, inability to identify self)
- Drowsiness
- Dysuria (urinary retention)
- Dreadful hallucinations (visual, auditory)
- Death (if untreated) - from respiratory failure
- P.C. Dikshit Textbook of Forensic Medicine and Toxicology
Peripheral vs. Central Toxicity
- Peripheral: Mydriasis, dry skin/mucosa, tachycardia, fever, flushing (vasodilation) - less life-threatening
- Central: Delirium, hallucinations, agitation, coma - more serious; central involvement + peripheral signs = most severe
Behavioral Hallmarks
Patients become restless, sleepless, may try to climb or break objects, tend to run out of bed, pick at imaginary objects (carphologia - picking imaginary threads), and perform pin-rolling movements. They typically remember nothing afterwards due to stupefaction (anterograde amnesia). This behavioral profile has significant forensic relevance.
Time Course
- Symptoms begin within 30-60 minutes of ingestion
- Effects can last 24-48 hours and have been reported to persist up to 2 weeks
- As intoxication advances, excitement phase lasts 1-2 hours, then deep coma/sleep - which may end in death
Fatal Dose and Period
| Parameter | Value |
|---|---|
| Fatal dose | 4 fruits; ~100 seeds; or 0.5-1 g of active principles |
| Fatal period | 24 hours (some sources: 1-2 days if untreated) |
Treatment
Emergency Management
- Gastric lavage - stomach wash with plain water or weak potassium permanganate solution (even hours later, as Datura reduces GI motility, slowing absorption)
- Activated charcoal - to reduce absorption
- Whole-bowel irrigation - recommended if a large number of seeds were ingested (seeds can become trapped in GI folds)
- Airway, breathing, circulation (ABCs) - oxygen, hydration, supportive care
- Nursing care - prevent falls, self-injury, or wandering (patient may be extremely agitated/delirious)
Antidotes
- Physostigmine (reversible acetylcholinesterase inhibitor) - drug of choice; 1-2 mg IV slowly, every 5 minutes until signs resolve. Crosses the blood-brain barrier, reversing both central and peripheral effects. - Tintinalli's Emergency Medicine
- Prostigmine (Neostigmine) - 0.5-1 mg SC; effective but does NOT cross the blood-brain barrier (peripheral effects only)
- Pilocarpine nitrate - 5 mg SC, repeated after 2 hours; muscarinic agonist but no central action
Symptom Control
- Benzodiazepines - for agitation and seizure control
- Sponging - for hyperthermia
- Short-acting barbiturates - for convulsions
- Avoid: Phenothiazines and other anticholinergic medications; Morphine (physiological antidote in theory, but contraindicated in practice)
Post-Mortem Findings
- Signs of asphyxia
- Crushed seeds in the stomach and small intestine
- Dilated pupils
- Seeds resist putrefaction and can survive decomposition, aiding forensic identification
Medicolegal Significance
Datura is of considerable forensic importance. Crushed seeds are odorless and nearly tasteless when mixed with food, making them a tool of criminal intent:
- Mixed with sweets, pan-beedi, or food grains to stuporize victims for robbery, theft, or rape
- Used to kidnap children
- Rarely mixed with tobacco or cannabis in cigars/bidis
- Historically used for criminal abortion
- Accidental poisoning is rare but possible through fodder contamination
- The plant is associated with religious use among Himalayan sadhus
Key forensic differentials: Acute hypoglycemia, neuroleptic malignant syndrome, hallucinogen toxicity, serotonin syndrome, meningitis, sepsis, lithium toxicity - all can be ruled out by appropriate investigations and history. Published case series document characteristic presentations.
Sources:
- The Essentials of Forensic Medicine and Toxicology, 36th ed. (2026)
- P.C. Dikshit Textbook of Forensic Medicine and Toxicology
- Tintinalli's Emergency Medicine: A Comprehensive Study
- Katzung's Basic and Clinical Pharmacology, 16th ed.
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