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Atropa belladonna, commonly known as belladonna or deadly nightshade, is a toxic perennial herbaceous plant in the nightshade family Solanaceae.
The plant was baptized Atropa belladonna by Carl Linnaeus (1707–1778). Atropos (lit. "unturning one"), one of the Three Fates in Greek mythology, is said to have cut a person's thread of life after her sisters had spun and measured it.


Usage
Linnaeus chose the species name belladonna ("beautiful woman" in Italian) in reference to the cosmetic use of the plant during the Renaissance, when women used the juice of the berries in eyedrops intended to dilate the pupils and make the eyes appear more seductive. 

The use of deadly nightshades as a poison was known in ancient Rome, as attested by the rumor that the Roman empress Livia Drusilla used the juice of Atropa belladonna berries to murder her husband, the emperor Augustus.

In the past, witches were believed to use a mixture of belladonna, opium poppy and other plants, typically poisonous (such as monkshood and hemlock), in flying ointment, which they allegedly applied to help them fly to gatherings with other witches or to experience bacchanalian carousal.


Effects
Adverse effects includes minor visual distortions, inability to focus on near objects, and increased heart rate. Prolonged usage was reputed to cause blindness. Its use by mouth increases risk in numerous clinical conditions, such as complications of pregnancy, cardiovascular diseases, gastrointestinal disorders, and psychiatric disorders, among others.