Strychnine

Strychnine is a highly toxic alkaloid derived from the seeds of Strychnos nux-vomica that acts as a competitive antagonist of glycine receptors in the spinal cord and brainstem. It has no established therapeutic applications and is primarily documented in toxicology literature due to its extreme lethality at doses as low as 1–2 mg/kg in humans.

Origin & History

Strychnine is an indole alkaloid derived from the seeds of the tropical trees Strychnos nux-vomica and Strychnos pierriana. It is produced through seed grinding, solvent extraction, and purification processes.

Historical & Cultural Context

Strychnine has historical use in Traditional Chinese Medicine for conditions like tumors, though modern reviews highlight high toxicity risks.[2][8] In Western contexts, it has been recognized as a poison since the 19th century.[6]

Health Benefits

• No therapeutic health benefits supported by clinical trials; evidence consists solely of poisoning cases.[1][5][8]

How It Works

Strychnine competitively blocks glycine receptors, specifically the strychnine-sensitive GlyR alpha-subunit chloride ion channels, in the spinal cord interneurons and brainstem. By preventing glycine-mediated inhibitory neurotransmission, strychnine removes the inhibitory brake on motor neurons, leading to uncontrolled excitatory signaling throughout the central nervous system. This results in simultaneous, violent contraction of all skeletal muscle groups, progressing to opisthotonus, respiratory failure, and death.

Scientific Research

Strychnine lacks human clinical trials or meta-analyses supporting any therapeutic use. The available evidence comprises case reports of poisoning from accidental or deliberate ingestion, with no PubMed PMIDs for therapeutic RCTs identified.[1][5][8]

Clinical Summary

No clinical trials have evaluated strychnine for therapeutic benefit; the entirety of human data originates from poisoning case reports, autopsy studies, and historical toxicology records. Case series document that oral ingestion of approximately 5–10 mg produces severe convulsions in adults, with death from respiratory muscle paralysis occurring within 1–3 hours without intervention. A historical review of nux-vomica-based traditional remedies found no controlled evidence supporting efficacy for any condition, while documenting numerous fatalities. The overall evidence base is rated extremely low quality, and no regulatory agency has approved strychnine for any human therapeutic use.

Nutritional Profile

Strychnine (C₂₁H₂₂N₂O₂, MW 334.41 g/mol) is a highly toxic indole alkaloid isolated primarily from the seeds of Strychnos nux-vomica (containing ~1.5–5% strychnine by dry weight). It has no nutritional value whatsoever. It is not a nutrient, food component, or dietary supplement. Key biochemical characteristics: • Bioactive compound classification: Monoterpene indole alkaloid (specifically a strychnane-type alkaloid). • Oral bioavailability: Rapidly and nearly completely absorbed from the gastrointestinal tract; bioavailability estimated at ~100% via oral route. • Lethal dose: Approximately 1–2 mg/kg body weight in humans (roughly 60–120 mg for an adult), though fatalities have occurred at doses as low as 15–30 mg. • Mechanism of toxicity: Acts as a competitive antagonist at glycine receptors (primarily GlyR α1 subunits) in the spinal cord and brainstem, blocking inhibitory postsynaptic signaling, leading to uncontrolled excitatory neural activity and fatal convulsions. • Contains no macronutrients (protein, carbohydrates, fats), no vitamins, no minerals, and no dietary fiber. • Lipid solubility: Moderate (log P ~1.93), enabling rapid CNS penetration. • pKa: ~8.26 (weakly basic tertiary amine), meaning it is predominantly ionized at physiological pH, yet still crosses biological membranes efficiently. • Metabolism: Hepatic, primarily via cytochrome P450 (CYP3A4 and CYP2B6) oxidation to strychnine N-oxide and other hydroxylated metabolites. Half-life approximately 10–16 hours. • No recognized nutritional profile exists; the compound is classified strictly as a poison/toxicant by all major regulatory and pharmacological authorities (WHO, FDA, EMEA). Any ingestion, even in trace amounts historically found in some adulterated herbal tonics or so-called 'bitter tonics,' poses serious risk of toxicity with zero nutritional or caloric contribution.

Preparation & Dosage

No clinically studied therapeutic dosage ranges exist as strychnine lacks approved medical uses. Toxic effects occur at low doses, making it highly unsafe for supplementation. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

None, due to high toxicity.

Safety & Interactions

Strychnine is acutely toxic to humans at doses of 1–2 mg/kg body weight, with the oral lethal dose (LD50) in adults estimated at approximately 30–120 mg total. It potentiates other CNS stimulants and convulsants including caffeine and amphetamines, dramatically increasing seizure risk and lethality. Strychnine is absolutely contraindicated in pregnancy, as it crosses the placental barrier and causes fetal convulsions and death; it is also contraindicated in individuals with any seizure disorder, liver impairment, or respiratory compromise. There is no established safe dosage for human consumption, and activated charcoal plus benzodiazepine administration remains the primary emergency treatment for acute exposure.