Nicotine Dosage Guide

## Lethal Dose Estimates The traditional estimate of 40-60 mg as the lethal dose for adults is likely a significant underestimate. A 2014 review by Bernd Mayer concluded that the actual lethal dose is more likely 500-1,000 mg (6.5-13 mg/kg) of ingested nicotine. However, the 40-60 mg figure remains clinically relevant as a dose that can cause severe poisoning requiring emergency intervention. Individual variation is significant, and much lower doses can be dangerous for children -- as little as 1 mg of nicotine can cause symptoms in a small child, and ingestion of a single cigarette or a small amount of e-liquid can require emergency treatment. ## Biphasic Poisoning Pattern Nicotine poisoning follows a characteristic biphasic pattern reflecting nicotine's initial stimulatory and subsequent depressant effects on nAChRs: **Early phase (stimulatory -- minutes to 1 hour):** - Nausea and vomiting (often the first and most prominent symptom) - Excessive salivation and drooling - Abdominal pain and cramping - Headache and dizziness - Pallor and sweating - Tachycardia and hypertension - Tremor and muscle fasciculations - Agitation and restlessness **Late phase (depressant -- if dose is high enough):** - Bradycardia (dangerously slow heart rate) and hypotension - Respiratory depression and potential respiratory failure - Seizures -- can be the presenting symptom in severe cases - Lethargy, confusion, and loss of consciousness - Muscle paralysis, including respiratory muscles - Cardiovascular collapse and cardiac arrest in fatal cases ## Common Causes of Nicotine Poisoning **E-liquid ingestion** is the leading cause of serious nicotine poisoning in children. A 30 mL bottle of 36 mg/mL e-liquid contains 1,080 mg of nicotine. These products are brightly colored and sweetly flavored, making them attractive to children. Always store e-liquid in locked, childproof containers. **Nicotine patches** can cause poisoning when multiple patches are worn simultaneously, when patches are left on overnight when not indicated, or when used patches (which still contain significant nicotine) are accessed by children or pets. **Excessive vaping** with high-nicotine salt formulations (50 mg/mL) can cause toxicity, particularly in individuals with low tolerance, though self-limiting nausea usually prevents serious poisoning. **Green Tobacco Sickness** affects farm workers who absorb nicotine through the skin while harvesting wet tobacco leaves. Symptoms include nausea, vomiting, headache, and weakness. Protective clothing and gloves reduce risk significantly. ## Emergency Response - Call poison control (1-800-222-1222 in the US, 111 in the UK) or emergency services for any suspected nicotine poisoning, especially involving children - Remove the source of exposure (remove patches, rinse skin if dermal contact) - Do not induce vomiting if e-liquid was ingested -- aspiration risk - Monitor breathing and heart rate - Keep the person calm and still **Hospital treatment** may include activated charcoal (if recent ingestion), IV fluids, atropine for severe bradycardia, benzodiazepines for seizures, and intubation with mechanical ventilation for respiratory failure. ## Risk to Children and Pets E-liquid is particularly dangerous to children and pets because of its sweet taste and attractive appearance. Dogs are especially susceptible -- a lethal dose for a small dog can be as low as 10 mg. Cigarette butts, nicotine gum, and patches in accessible trash are also hazards. The Child Nicotine Poisoning Prevention Act of 2015 (US) requires child-resistant packaging for e-liquid, but enforcement is imperfect. Never leave nicotine products where children or animals can reach them.