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Henbane contains tropane alkaloids—primarily hyoscyamine, scopolamine, and atropine—that function as anticholinergic agents. These compounds block acetylcholine from binding to muscarinic receptors throughout the nervous system, inhibiting parasympathetic nerve signals. This mechanism produces antispasmodic effects on smooth muscle, reduces bodily secretions, and creates sedative and analgesic properties. The same anticholinergic action causes characteristic side effects including dilated pupils, dry mouth, rapid heart rate, and potential hallucinations.
Does henbane interact with any medications?
Henbane poses serious drug interaction risks. Combining it with other anticholinergic medications can cause dangerous additive effects, including severe confusion, urinary retention, rapid heart rate, and potentially life-threatening arrhythmias. It may interact dangerously with CNS depressants, tricyclic antidepressants, antihistamines, and Parkinson's disease medications. Due to its high toxicity and unpredictable alkaloid content, henbane should never be combined with any medication without strict medical supervision.
What is a safe dosage of henbane?
There is no safe self-administered dosage of raw henbane. The plant is highly toxic, with tropane alkaloid concentrations varying unpredictably between individual plants and plant parts. Only pharmaceutical-grade preparations with standardized, measured alkaloid content should ever be used, and exclusively under qualified medical supervision. Historical texts reference traditional doses, but these carry substantial overdose risk. Modern clinical use is extremely limited and highly controlled due to the narrow margin between therapeutic and toxic doses.
Is henbane safe to use during pregnancy?
No, henbane is absolutely unsafe during pregnancy and breastfeeding. The tropane alkaloids—hyoscyamine, scopolamine, and atropine—cross the placenta and may cause fetal harm or developmental abnormalities. These compounds also pass into breast milk and can cause anticholinergic poisoning in nursing infants. Pregnant or breastfeeding individuals must avoid all exposure to henbane in any form. Evidence level C indicates limited clinical data, but the known pharmacology confirms significant risk.
What was henbane used for traditionally?
European folk medicine traditionally used henbane as an analgesic for pain relief, an antispasmodic for bladder and digestive cramps, and as a sedative for insomnia and anxiety. It was also historically used in "witches' flying ointments" for its hallucinogenic properties. Evidence level C (uncontrolled studies and case reports) supports these historical applications, though the herb's narrow therapeutic window made accidental poisoning common. Modern therapeutic use is restricted to pharmaceutical preparations due to toxicity concerns.
Is henbane poisonous to humans?
Yes, henbane is highly poisonous to humans. All parts of the plant contain toxic tropane alkaloids that can cause anticholinergic poisoning symptoms including hallucinations, delirium, rapid heart rate, dilated pupils, dry mouth, urinary retention, and constipation. Overdose can result in respiratory failure, convulsions, cardiovascular collapse, and death. The plant's toxicity is dose-dependent but unpredictable due to varying alkaloid concentrations. Medical supervision is essential for any therapeutic use, and self-administration of raw henbane is strongly contraindicated.
PubMed-compiled information sheet
This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.
Compiled from 30 PubMed articles · model: gemma4:31b
Summary
Henbane (Hyoscyamus niger) is a toxic plant containing anticholinergic tropane alkaloids used historically in medicine but capable of causing severe poisoning [PMID:16145869, PMID:25386392].
Background
Hyoscyamus niger, also known as black henbane, is a member of the Solanaceae family widely distributed in Europe and Asia [PMID:25386392, PMID:32455988].
Traditional uses
It has been used in traditional medicines for centuries as a herbal medicine [PMID:25386392]. Specific traditional applications include the use of seeds in Turkish folk medicine to remove worms from the eyes [PMID:32455988] and its use in Persian medicine as a replacement spice to help quit opium addiction [PMID:34222532]. Historically, it was used for its sedative, hypnotic [PMID:27086450], and antidepressant properties [PMID:7857505].
Active compounds
All parts of the plant, including leaves, seeds, and roots, contain tropane alkaloids such as hyoscyamine, atropine, and scopolamine [PMID:25386392]. Other identified constituents include coumarins, flavonoids (such as rutin), sterols, tannins, and terpenes [PMID:18773124, PMID:31135192].
Mechanism of action
The tropane alkaloids in henbane act as anticholinergics by blocking the action of the neurotransmitter acetylcholine at muscarinic and/or nicotinic receptors in the central and peripheral nervous systems [PMID:36109439].
Clinical evidence
Evidence DCardiovascular effects
Crude extract caused dose-dependent falls in arterial blood pressure, cardiodepressant effects on atrial contractions, and vasodilator activity in rat and rabbit models [PMID:18773124]
Evidence DFungal infections
Extracts demonstrated in vitro antifungal activity against Candida species, dermatophytes, and Malassezia furfur [PMID:31135192]
Evidence DMyiasis (larvae)
Alkaloid extracts from seeds displayed significant insecticidal activity against Lucilia sericata larvae [PMID:32455988]
Safety & adverse effects
Ingestion can cause severe anticholinergic toxicity, which may be fatal [PMID:16145869]. Symptoms include mydriasis, tachycardia, arrhythmia, agitation, convulsions, coma, dry mouth, thirst, slurred speech, dysphagia, pyrexia, nausea, vomiting, headache, blurred vision, photophobia, urinary retention, and delirium [PMID:25386392, PMID:16145869]. In children, atypical presentations such as hyperactivity and euphoria without agitation have been reported [PMID:42181405]. Direct contact with the plant can cause mydriasis [PMID:1757054].
Evidence summary
The available evidence consists primarily of case reports of poisoning, in vitro studies, and descriptive reviews. There are no high-level clinical trials (RCTs) or meta-analyses provided to support therapeutic efficacy.
PubMed sources
1.PMID: 16145869 (2005) — [Intoxication with henbane]. · Lijecnicki vjesnik
2.PMID: 25386392 (2014) — Black henbane and its toxicity - a descriptive review. · Avicenna journal of phytomedicine
3.PMID: 42181405 (2026) — Hyperactivity and Euphoria Without Agitation Due to Hyoscyamus niger (Henbane) Poisoning in a Child. · Cureus
4.PMID: 34222532 (2021) — Treatment of opium addiction in persian medicine: A review study. · Journal of education and health promotion
5.PMID: 27086450 (2015) — [On the history of barbiturates]. · Dansk medicinhistorisk arbog
No direct government monograph is available for this herb. The content below is AI-generated and has not been verified against an authoritative government source. Use the search links to check official sources before relying on this information.
— Beauty of the beast: anticholinergic tropane alkaloids in therapeutics.
· Natural products and bioprospecting
7.PMID: 7857505 (1994) — Treatment of depression. · Journal of geriatric psychiatry and neurology
8.PMID: 32455988 (2020) — Insecticidal Activity of Hyoscyamus niger L. on Lucilia sericata Causing Myiasis. · Plants (Basel, Switzerland)
9.PMID: 31135192 (2020) — Antifungal activity of Mongolian medicinal plant extracts. · Natural product research
10.PMID: 18773124 (2008) — Cardiovascular inhibitory effects of Hyoscyamus niger. · Methods and findings in experimental and clinical pharmacology
11.PMID: 1757054 (1991) — [Mydriasis caused by plant contact]. · Fortschritte der Ophthalmologie : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft