Lobelia
Lobelia inflata
Lobelia ('Indian tobacco') is a potent, nicotine-like herb used historically for asthma and smoking cessation; it is effective at relaxing airways in small doses but has a narrow safety margin and poor clinical support.
At a Glance
- Best known for
- Bronchodilator and expectorant in traditional asthma and bronchitis use, Lobeline studied as a smoking-cessation aid (not shown effective in trials), Antispasmodic used topically for muscle tension
- Evidence
- Preliminary
- Typical dose
- 0.2–0.6 mL 1:8 tincture, repeated once after 30 min if needed
- Type
- Herb
What is Lobelia?
Lobelia inflata is a North American annual in the bellflower family, named Indian tobacco because Native Americans smoked its leaves for asthma and respiratory illness. It became the signature remedy of the 19th-century Thomsonian movement, whose founder Samuel Thomson used it as an emetic and 'relaxant' and was tried (and acquitted) for murder after a patient's death. Its principal alkaloid, lobeline, acts on nicotinic receptors and was sold as a smoking-cessation aid in the 20th century until the FDA removed those products in 1993 for lack of efficacy evidence. Today lobelia is used in small, carefully measured doses by trained herbalists for asthma, spasmodic coughs and muscle tension, and is widely regarded as one of the more hazardous herbs in common use.
Known Health Benefits
How It Works
Lobeline is a partial agonist and antagonist at nicotinic acetylcholine receptors, producing nicotine-like effects (stimulation then depression of the autonomic ganglia, respiratory stimulation at low doses, nausea and vomiting at higher ones) without being a full nicotine substitute. In the airways it relaxes bronchial smooth muscle and stimulates expectoration, likely through both receptor effects and reflex actions from gastric irritation. Lobeline also inhibits the vesicular monoamine transporter (VMAT2) and dopamine transporter, altering dopamine release in the brain, which is the basis of modern research interest in it for stimulant addiction and ADHD. The emetic effect comes from stimulation of the chemoreceptor trigger zone and vagal afferents.
What Research Says
Despite long use, lobelia has almost no supportive clinical research. A Cochrane review of lobeline for smoking cessation found no trials of adequate quality showing it helps people quit, and the FDA banned lobeline cessation products in 1993. Small pilot studies have examined lobeline for methamphetamine dependence and ADHD, with inconclusive results. There are no controlled trials of lobelia for asthma, bronchitis or cough; animal studies confirm bronchodilator and respiratory-stimulant effects but also document toxicity at modest doses. Poison control data describe nausea, vomiting, tachycardia and, in large overdoses, seizures and coma. The research picture is therefore: pharmacologically active and interesting, clinically unproven, and risky enough that the therapeutic window is the main thing users need to know.
Active Compounds
Piperidine alkaloids (lobeline, lobelanine, lobelanidine, isolobelanine), chelidonic acid, resin, lobelacrin
Forms & Bioavailability
Lobeline is well absorbed orally and across mucous membranes, acts within 15–30 minutes and is metabolized in the liver with a half-life of several hours. The alkaloid content of dried herb varies widely (0.2–0.6%), which combined with the narrow safety margin makes unstandardized products unpredictable. Acetic acid (vinegar) extracts stabilize the alkaloids and are the traditional preparation. Topical absorption is sufficient to produce local antispasmodic effects.
Dosage Guidance
| Use Case | Dosage |
|---|---|
| Asthma / spasmodic cough (acute) | 0.2–0.6 mL 1:8 tincture, repeated once after 30 min if needed |
| Dried herb capsules | 50–200 mg up to 3x daily |
| Topical for muscle tension | Apply lobelia-infused oil or liniment to affected area 2–3x daily |
| Smoking cessation | Not recommended |
Always consult a healthcare provider for personalized dosing.
Natural Food Sources
- None — not a food plant and not safe to consume casually
Potential Side Effects
Nausea, vomiting, sweating, dizziness, tremor, rapid heartbeat; higher doses cause profuse vomiting, hypotension, convulsions, coma and respiratory depression; narrow margin between therapeutic and toxic dose
Who Should Avoid It
- Heart disease, arrhythmia or high blood pressure
- Pregnancy and breastfeeding
- Seizure disorders
- Peptic ulcer, severe GI disease or tendency to vomit
- Children and older adults (greater sensitivity to alkaloids)
- Any use without measured dosing — never 'eyeball' lobelia
Pregnancy & Lactation
Lobelia is contraindicated in pregnancy. Lobeline crosses the placenta, has nicotine-like effects on fetal blood flow and heart rate, and the herb was historically used to induce vomiting and labor. It should also be avoided while breastfeeding; lobeline is expected to pass into milk and could cause vomiting or respiratory effects in an infant.
Known Drug Interactions
Additive effects with nicotine replacement and smoking-cessation drugs (varenicline, bupropion); may interact with lithium (increases clearance); additive stimulant effects with caffeine and sympathomimetics; may potentiate or interfere with bronchodilators; CNS effects with psychiatric medications
Evidence Classification
Based on in vitro studies, animal models, pilot trials, or traditional use documentation. Clinical evidence is limited.
Frequently Asked Questions
Can lobelia help me quit smoking?
The evidence says no. Lobeline mimics some nicotine effects, which is why it was marketed for quitting, but a Cochrane review found no reliable trials showing it helps, and the FDA banned lobeline cessation products in 1993. Nicotine replacement, varenicline and bupropion are proven options; combining lobelia with them adds nausea and cardiac risk without benefit.
Is lobelia safe for asthma?
In skilled hands and tiny doses it can relax the airways, and it has a long traditional record. But it is not a substitute for a rescue inhaler: it works less reliably, takes longer, and the dose that helps is close to the dose that causes vomiting and a racing heart. Anyone with asthma should have prescribed medication and treat lobelia, if at all, as a supervised adjunct.
What does a lobelia overdose look like?
Early signs are nausea, vomiting, sweating, dizziness and a rapid pulse, usually within an hour. Larger doses cause profuse vomiting (which limits absorption), low blood pressure, tremors, convulsions and, rarely, coma or respiratory failure. Deaths are rare but documented. Contact poison control if someone has taken more than a measured dose.
Why do herbalists call lobelia a 'relaxant'?
Thomsonian and later Western herbalists prize lobelia for relaxing spasm, whether in the bronchi, gut or skeletal muscles, and often add a few drops to formulas to enhance other herbs' action. The effect is real at low doses, but modern herbal safety guides place lobelia in their most restricted category because of its toxicity. If you want an antispasmodic, gentler options like skullcap, chamomile or cramp bark exist.
References
- Lobeline for smoking cessation. Stead LF, Hughes JR. Cochrane Database Syst Rev (2012)
- History, chemistry and biology of alkaloids from Lobelia inflata. Felpin FX, Lebreton J. Tetrahedron (2004)
- Lobeline: a nicotinic receptor ligand with potential therapeutic applications. Dwoskin LP, Crooks PA. Biochem Pharmacol (2002)
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This entry is for educational purposes only. It is not medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement regimen, especially if you take medications or have health conditions.