Belladonna
Belladonna is a poisonous plant native to parts of Asia and Europe. It is sometimes known as a deadly nightshade. All parts of the plant are toxic. Belladonna contains chemicals that can alter the function of the body's nervous system and cause changes to saliva, sweat, pupil size, urination, digestive functions, and others. It can also increase heart rate and blood pressure. Despite known safety concerns, belladonna is used for asthma, the common cold, hemorrhoids, Parkinson's disease, and many other conditions.