Deadly Nightshade

(Atropa bella-donna)

Belladonna (Atropa belladonna) is a powerful, highly toxic nightshade and the original plant source of the alkaloid atropine. Traditionally used for strong antispasmodic and pain-relieving effects, it acts on the nervous system and smooth muscle; however, because of its potent tropane alkaloids, it should be used only in small, measured doses by trained practitioners and is of historical/teaching interest today.

Plant family: Solanaceae

Other significant  names: Belladonna

Parts used: Herba and radix.

Common forms of prescription: Tincture

Restriction: The Human Medicines Regulations 2012, Schedule 20, Part II.

This information is for educational purposes about traditional herbal use and is not a substitute for medical advice or treatment. Atropa belladonna should only be used under the supervision of a qualified medical herbalist or healthcare professional.

Close-up of a pink and purple flower with green leaves, with a dark blurred background.

Deadly Nightshade (Atropa bella-donna) - Clinical Snapshot

(Educational purposes only)

Primary actions

  • Anticholinergic
    Helps block the action of acetylcholine at parasympathetic nerve endings. This slows secretions and smooth muscle activity (e.g., reduced saliva, reduced gut motility, dilated pupils).

  • Antispasmodic
    Relaxes smooth muscle spasm, helping to ease cramping pain in areas such as the gut, bile ducts, uterus, or urinary tract.

  • Analgesic
    Has a pain-relieving effect.

  • Antisialagogue
    Reduces saliva production; useful when excessive drooling or salivation occurs.

  • Hypohidrotic
    Reduces sweating; indicated for excessive perspiration.

  • Narcotic
    Strongly affects the nervous system, with sedative and pain-dulling effects. In higher doses, this becomes toxic.

Note: Atropa belladonna is a highly toxic plant and is only used in minute, carefully controlled doses by trained practitioners.

Close-up of a plant with shiny black berries and green leaves.

Primary indications

Atropa bella-donna is a Schedule 20 (UK) herb with high toxicity and a very narrow therapeutic window. In modern herbal practice, it is rarely used, and only by suitably qualified practitioners in minute, tightly controlled doses.

When used clinically, it is primarily considered for:

  • Severe smooth-muscle spasm / “colicky” pain of the gastrointestinal tract (acute cramping/spasm).

  • Biliary tract spasm / biliary colic (cramping pain linked to spasm in the bile ducts or gallbladder).

  • Marked parasympathetic overactivity with troublesome secretions, where an experienced practitioner is specifically seeking an antisialagogue / hypohidrotic effect (e.g., excessive salivation or heavy sweating/hot flush sweating).

Important safety note: This herb is not suitable for self-treatment. Toxicity can occur due to dosing errors or individual sensitivity, and use requires professional supervision and comprehensive interaction screening.

    • Glaucoma (especially angle-closure/narrow-angle glaucoma).

    • Urinary retention or obstructive uropathy (e.g., prostatic hypertrophy/bladder neck obstruction).

    • Obstructive gastrointestinal disease (e.g., pyloric/intestinal obstruction), paralytic ileus, or marked intestinal atony (especially in older/debilitated people).

    • Severe ulcerative colitis or toxic megacolon.

    • Myasthenia gravis.

    • Unstable cardiovascular disease / myocardial ischaemia, or situations where significant tachycardia would be hazardous.

    • Children (commonly “not recommended under 12” for belladonna-alkaloid medicines; plant ingestion in children is particularly dangerous).

    • Avoid during breastfeeding due to belladonna’s narrow therapeutic index and variable potency.

    • Avoid in pregnancy as a precaution (insufficient safety data + anticholinergic risk; use only if “clearly needed” applies to pharmaceutical belladonna-alkaloid combinations, not self-care).

    • Older adults, cognitive impairment, delirium risk (more sensitive to anticholinergic effects).

    • Hot environments / fever risk (reduced sweating can contribute to overheating/heat illness).

    • Chronic lung disease (anticholinergics can thicken secretions and contribute to mucus plugging).

  • Anything that increases “anticholinergic burden” can intensify side effects (e.g., sedating antihistamines, tricyclic antidepressants, meclizine, antipsychotics, other antimuscarinics, plus alcohol/sedatives increasing CNS effects) (U.S. Food and Drug Administration [FDA], 2019).

  • Belladonna toxicity produces a classic anticholinergic toxidrome. Symptoms often begin within 1–4 hours of ingestion (sometimes faster), and effects may last hours to days.

    Early / common signs

    • Dry mouth, intense thirst, difficulty swallowing

    • Dilated pupils, blurred vision, light sensitivity

    • Hot, flushed, dry skin (reduced sweating) and rising temperature

    • Fast heartbeat / palpitations

    • Constipation or reduced bowel sounds; abdominal bloating

    • Difficulty passing urine / urinary retention

    CNS / severe toxicity

    • Agitation, confusion, hallucinations, delirium

    • Ataxia/staggering, slurred speech

    • Seizures, severe hyperthermia, coma / collapse

    A mnemonics fir overdose/toxicity signs: “red as a beet, dry as a bone, blind as a bat, mad as a hatter, hot as a hare, full as a flask.”

  • If someone has eaten any part of the plant by mistake (UK what-to-do)

    Because belladonna can be dangerous even in small amounts, treat any ingestion as urgent (Minns, 2008).

    What to do immediately

    1. Call 999 or go to A&E immediately if:

      • it’s a child, or

      • there are any symptoms, or

      • you believe a potentially harmful amount was eaten.

    2. If you’re not sure whether what was eaten is harmful (or there are no symptoms yet), call NHS 111 for urgent advice.

    While waiting for help

    • If conscious, encourage them to spit out any remaining plant material in the mouth.

    • Do not try to make them vomit.

    • Do not give anything to eat or drink unless advised by a clinician.

    • Try to identify the plant and keep a sample/photo for clinicians.

    • If they vomit spontaneously, save a small sample (container/bag) for healthcare staff.

    • Monitor: if they become drowsy/unconscious, place in the recovery position; begin CPR if not breathing.

    Important note

    Poisoning symptoms can sometimes be delayed, so don’t “wait and see.” Get advice quickly even if they seem OK initially National Health Service, 2025).

Close-up of a pink flower with green leaves in natural light.

Traditional History of Atropa bella-donna (Deadly Nightshade)

In older European herbals, Atropa belladonna sits in a strange category: feared as a poison, yet repeatedly discussed because its effects were so striking that physicians and herbal writers couldn’t ignore it. Grieve notes that in Chaucer’s day, the plant was known as “Dwale”, a name linked by some authorities to words meaning sleep or delay, reflecting the plant’s reputation for heavy, unnatural sleep and profound disturbance of the senses. She also ties the genus name Atropa to Atropos, the Fate who cuts the thread of life, an unusually blunt warning built into the plant’s identity. In this older tradition, belladonna is never portrayed as a gentle household remedy; where it appears, it is as a plant of strong effects and serious risk. (Grieve, n.d., p. 584–585)

One of the most famous strands of belladonna’s story sits at the intersection of beauty and danger. Grieve repeats the widely told tradition that Italian women used minute amounts of belladonna juice as eye drops to dilate the pupils and give the eyes a brighter, more “beautiful” appearance, one explanation often offered for the name “bella donna.” It’s a striking example of how the plant’s effects were recognised long before modern pharmacology: the dramatic pupil dilation was visible, immediate, and culturally memorable. Later, that same property moved into formal medicine, where belladonna alkaloids (especially atropine) became valued in ophthalmic practice for controlled pupil dilation, though importantly, in standardised medical preparations rather than casual domestic use. (Grieve, n.d., p. 585, 588)

Grieve also includes a compelling wartime-and-ritual thread: she records traditions linking belladonna to Bellona, the Roman goddess of war, including the idea that a priestly infusion was taken before worship and invocation, a suggestion that may offer another possible root for the name. Alongside this, she repeats the darker Scottish legend tied to “dwale,” which associates soldiers in the Macbeth era with being overcome after drink is adulterated with the plant. Whether folklore or embellished history, these stories show how belladonna became woven into the cultural imagination as something capable of overpowering the body and mind. (Grieve, n.d., p. 584–585)

Importantly, Grieve’s account also captures how earlier writers described poisoning and emergency response in their own era. She notes that accidental ingestion, particularly of the berries, was recognised as dangerous, and she lists features such as marked pupil dilation, severe disturbance of speech/voice, agitation, and unusual repetitive movements. She also includes period “first aid” measures used at the time (historically interesting, but not appropriate modern guidance). For a modern reader, this reinforces the same message that runs through belladonna’s entire Western history: fascination has always travelled alongside risk. (Grieve, n.d., p. 584).

Botany & identification features (Deadly nightshade)

Atropa belladonna (deadly nightshade) is a robust perennial in the Solanaceae (nightshade) family, typically found in semi-shaded, disturbed habitats (banks, scrub edges, old quarries/ruins), often favouring calcareous soils. It’s not a delicate woodland flower; in good conditions, it looks lush, substantial and bushy, with a presence that can be mistaken for “safe” until you notice the tell-tale features.

Key identification features (the quickest “tells”)

  • Unequal leaf pairs: leaves often appear in pairs of different sizes at the same point on the stem (one larger, one smaller).

  • Solitary axillary flowers: flowers are usually single and sit in the leaf axils (where the leaf meets the stem), not in clusters.

  • Drooping bell-shaped corolla: the flowers hang pendant and are bell-shaped, typically a muted purple-brown with greenish tones.

  • Glossy black berry + persistent calyx: the fruit is a shiny black berry (cherry-like) sitting in a persistent green calyx (“green collar”/star at the base).

Habit & stem

  • Perennial, regrowing from a thick rootstock.

  • Stout, herbaceous, branching stems, often with a purplish-green cast.

  • Mature height commonly ~1–1.5 m (can be taller if sheltered and well fed).

Leaves

  • Large, oval to broadly elliptic, with smooth margins and pointed tips.

  • Often described as dull/dark green and slightly soft to the touch.

  • The unequal paired leaves are one of the best “student cues” once you’ve learned to look for it.

Flowers (summer into early autumn)

  • Solitary, pendulous, bell-shaped flowers in the leaf axils.

  • Colour is usually dusky purple-brown rather than bright purple.

  • Not arranged in spikes (unlike foxglove), and not star-shaped (unlike many Solanum species).

Fruit (late summer into autumn)

  • Smooth, glossy black berries, often described as temptingly cherry-like.

  • Each berry sits within a persistent green calyx, which can look like a small green star/cup.

  • This is the key public-safety point: the berries look edible and are the classic route to accidental poisoning.

Roots

  • A thick, fleshy perennial root system (historically a major “drug” part in pharmacy).

Close-up of a bush with black berries and green leaves

UK distribution, native range & habitat

Native range: Atropa belladonna is native across Europe, extending into Western Asia (to northern Iran) and parts of North-West Africa.

Where it grows in the UK: In Britain, it’s found mainly in the southern half, especially where there are chalk/limestone (calcareous) soils and disturbed ground. Records further north are often thought to be remnants of past cultivation for medicinal use, rather than strong natural populations.

Typical habitats/land types: Belladonna tends to favour calcareous soils and “edge” habitats such as scrub, open woodland/woodland margins, hedge-banks, path edges, field margins, walls and disturbed sites (including old quarries and similar ground).

Is it common in the UK? Overall, it’s localised rather than widespread; you can find it reliably in the right southern chalk/limestone settings, but it isn’t a “common everywhere” wild plant.

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