Belladonna is a very poisonous plant species. A common name for
Belladonna is deadly nightshade. The plant species is distributed
throughout Europe, West Asia, North America and North Africa.

Allopathic uses for Belladonna
Belladonna is given in small amounts for over the counter flu and cough
medicines. It is also used in prescription drugs for Irritable Bowel
Syndrome, acute enterocolitis and as an adjunctive therapy in the
treatment of duodenal ulcers. Eye doctors also use this drug in small
amounts to dilate pupils.
Homeopathic uses for Belladonna
Hanhemann
proved this remedy in 1799 and used it to treat scarlett fever.
Belladonna is used to treat conditions with a sudden onset. The type
of conditions Belladonna treatments are similar to the symptoms if
someone is poisoned with Belladonna. Belladonna poisoning results in
people getting a high fever, sore throat or loss of voice, nausea,
delirium, muscle spasms, flushed skin and dilated pupils. Homeopathic
Belladonna is used to treat these type of conditions in a person.
Belladonna is also used to treat cold and flu symptoms, infections with
inflammation, intense pounding headaches, boils, earaches, seizures,
labor pain, pink eye, nose bleeds, nephritis(inflammation of the
kidneys) restless sleep, teething pain, tonsillitis, acne and sunburn.
Female use Belladonna to treat breast infections, urinary bladder
infections, menstrual cramps, and irritated nipples due to breast
feeding.
Symptoms for these conditions are usually
better with warmth and standing. Conditions usually worsen with cold
air, at night, movement and lying down.
Information Referenced from
http://en.wikipedia.org/wiki/Deadly_nightshade
http://www.answers.com/topic/belladonna
Complete Guide to Homeopathy. Dr. Andrew Lockie and Dr. Nicola Geedes.
If you know of other uses for allopathic or homeopathic Belladonna, please put them in our comments section.