Deadly nightshade
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- "Belladona" redirects here. For other senses of this word, see belladonna (disambiguation).
The Belladonna is native to Europe, North Africa, and West Asia, and has become naturalized in parts of North America. It is not nearly as common in the wild as many field guides would suggest. This is because it is readily attacked by mint flea beetles and has a low tolerance for direct sunlight. In areas where it has become naturalized it can often be found in shady, moist areas with a limestone rich soil.
Description
The Belladonna has dull green leaves and bell-shaped flowers that are an unremarkable shade of purple, which yield black, shiny berries measuring approximately 1 cm in diameter. It is an herbaceous shrub, and can grow to be approximately one metre tall. The leaves have an oily, "poison ivy"-like feel and can cause vesicular pustular eruptions if handled carelessly. Many animals, such as rabbits, birds and deer, seem to eat the plant without suffering harmful effects, though dogs and cats are affected. Many reports suggest that people have been poisoned by eating animals which have previously eaten Belladonna, though this has not been verified.Germination is often difficult due to the presence of germination inhibitors in the seeds. Belladonna is not common as a garden plant, and is considered a weed in some areas. It is not a very hardy perennial and is sensitive to being transplantated. Germination requires several weeks in warm, moist, absolutely sterile soil, usually far from normal garden conditions.
Toxicity
Belladonna is one of the most toxic plants found in the Western hemisphere. Children have been poisoned by eating as few as three berries. Ingestion of a leaf of the Belladonna can be fatal to an adult. The root of the plant is generally the most toxic part, though this can vary from one specimen to another.
All parts of the plant contain tropane alkaloids. The berries pose the greatest danger to children because they look attractive and have a somewhat sweet taste. Symptoms of belladonna poisoning are the same as those for atropine (the most well known of the tropane alkaloids), and include dilated pupils, tachycardia, hallucinations, blurred vision, loss of balance, a feeling of flight, staggering, a sense of suffocation, paleness followed by a red rash, flushing, husky voice, extremely dry throat, constipation, urinary retention, and confusion. The skin can completely dry out and slough off. Fatal cases have a rapid pulse that turns feeble. The antidote is physostigmine or pilocarpine, the same as for atropine.
The reason for most of these symptoms is because of atropine's effect on the parasympathetic nervous system. Atropine competitively inhibits the action of acetylcholine (ACh) at the acetylcholine receptor in the nerve synapse, thereby preventing the parasympathetic nervous system from sending out electrical nerve impulses. Since the parasympathetic nervous system regulates non-volitional/subconcious activities (such as sweating, breathing, and heart rate) when it is prevented from sending out signals, the heartbeat and breathing become extremely irregular.
The Belladonna is toxic to many domestic animals and livestock; Belladonna poisoning can lead to colic, depression, weakness, and lack of coordination in horses, with fatalities reported even for small amounts from 1 to 10 pounds (0.5 to 5 kg).
Uses
Cosmetics
The name belladonna originates from the historic use by ladies (Bella Donna is Italian for beautiful lady) to dilate their pupils; an extract of belladonna was used as eye drops as part of their makeup preparations. The Belladonna toxin's atropine content had the effect of dilating the pupil, thus making their eyes supposedly more attractive. Dilated pupils are considered more attractive (especially with females) because pupils normally dilate when a person is aroused, thus making eye contact much more intense than it already is. It had the adverse effect of making their vision a little blurry and making their heart rates increase.
Modern medicine
The plant is an important source of atropine, which is an effective antidote to the effects of poisoning by cholinesterase inhibitors such as Parathion and Malathion. Atropine will also reverse the effects of poisoning by nerve agents designed for chemical warfare. In Europe, the plant is specifically cultivated for this purpose.Optometrists and ophthalmologists use atropine for pupil dilation in eye examinations, though the dose used is extremely small.
It can be used in homeopathic remedies as a treatment for pinkeye.
Recreational drug
Occasionally, the plant is used for recreational purposes: it is consumed in the form of either a tea or simply raw, which can produce vivid hallucinations, described by many as a 'living dream'. It was used by the Manson Family and may have had influence in harming the members psychologically and making them more violent. Upon consumption of this plant, the user will experience all the severe, adverse anticholinergic effects before hallucinating and continue to do so while hallucinating. The effects of even a slight poisoning are sufficiently unpleasant that recreational users are most unlikely to attempt its use again — assuming that they survive the experience.See also
External links
- [Belladonna] in flying ointments
- [Erowid] on recreational uses.
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