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Atropa belladonna, commonly known as belladonna or deadly nightshade, is a perennial herbaceous plant in the nightshade family Solanaceae,
which includes tomatoes, potatoes, and eggplant (aubergine). The foliage and berries are extremely toxic when ingested, containing tropane alkaloids.
 These toxins include atropine, scopolamine and hyoscyamine, which cause delirium and hallucinations, and are also used as pharmaceutical anticholinergics.
 Atropa belladonna has unpredictable effects. The antidote for belladonna poisoning is physostigmine or pilocarpine, the same as for atropine.
 Deadly Nightshade has a long history of being used as a medicine, cosmetic, and poison. Early on, it was used as an anesthetic for surgery, and some used it as a poison.
Predating this, it was used to make poison-tipped arrows. Belladonna drops act as a muscarinic antagonist, blocking receptors in the muscles of the eye that constrict pupil size.
Belladonna is currently rarely used cosmetically, as it carries the adverse effects of causing minor visual distortions, inability to focus on near objects, and increased heart rate.
Prolonged usage was reputed to cause blindness.