Lobelia

botanical

What is it

Lobelia (Lobelia inflata, also called Indian tobacco) is a flowering plant whose aerial parts and seeds contain lobeline, an alkaloid with effects on nicotinic acetylcholine receptors. It has been used traditionally as a respiratory stimulant and smoking cessation aid.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Smoking cessation (traditional use)

Mixed

A Cochrane review found insufficient evidence that lobeline helps with smoking cessation. Other smoking cessation methods have stronger evidence and better safety profiles.

How it works

Lobeline acts as a partial agonist at nicotinic receptors and modulates dopamine release. This makes it pharmacologically similar in some ways to nicotine, which is why it has been studied as a smoking cessation aid. It also has expectorant, antispasmodic, and emetic effects in higher doses. Clinical evidence for smoking cessation is mixed; a Cochrane review found no clear benefit over placebo for quitting smoking. Despite long traditional use, modern human evidence is limited.

Dosage

No established RDA. Traditional doses are very small due to toxicity risk: 50-200 mg of dried herb, or tincture doses of a few drops. Higher doses cause nausea and vomiting.

When and how to take it

WHEN: Use only under qualified herbalist guidance, if at all. HOW: With water; do not exceed traditional small doses.

1 commercial form

Tincture / liquid extract

Most traditional form; allows small precise dosing.

Used drop by drop in traditional herbalism.

Safety

Lobelia has narrow safety margins. Side effects include nausea, vomiting, dizziness, sweating, tremors, and rapid heartbeat. High doses can cause coma, hypotension, and cardiac arrhythmias. The FDA has classified lobelia as 'unsafe' for general use.

Who should be cautious

Avoid in pregnancy, breastfeeding, children, heart disease, hypertension, seizure disorders, and any chronic illness. Do not use without practitioner guidance. Avoid combining with nicotine products.

Interactions

May interact with nicotine replacement therapy, varenicline, and other nicotinic agents. Possible additive effects with cardiovascular medications (antiarrhythmics, antihypertensives).

Frequently asked questions

Is lobelia safe to use to quit smoking?⌄

Lobelia has a narrow safety margin and the evidence for smoking cessation is not strong. Established methods like nicotine replacement, varenicline, and counseling have better-supported safety and efficacy profiles.

Why does lobelia cause vomiting?⌄

Lobeline activates emetic pathways in higher doses. This is why traditional 'emetic' use existed, but it also makes accidental overdose unpleasant or dangerous.

References

  • Lobelia on Wikidata — Wikidata link
  • Lobelia on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link
  • Research on Lobelia (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.