Some plants contain phytochemicals that have certain effects on the body. Spices also have various effects on our body. Many plants are also poisonous. Datura (Datura metel) flowers and fruits of the tree act as a medicine in quantitative use but overuse causes poisoning. There are many other plants that are medicinal plants, but overuse can cause various physical complications and sometimes poisoning. Template: Medcn

Cultivation of medicinal plants in the garden
Medicinal plants have been used in medicine in China for a long time. [4] These herbs are the basis of Ayurvedic medicine in India. In the West, this herbal medicine was introduced through Greek Hippocratic medicine. Among the famous herbalists are Ibn Sina (Persian), Galen (Roman), Paracelsus (German Swiss), Kalper (English) and John Milton Scader, Harvey Wicks Felter, John Uri Lloyd, experts in botany in the 19th and early 20th centuries. Although there is no such thing as a herbal medicine in modern times, many medicines are still made from medicinal plants.
Some herbs also contain drugs. These have been used in religious and psychiatric treatments since the Holocene era. Especially cannabis and cocoa trees. The people of North Peruvian society have been using the leaves of the cocoa tree as medicine since 6,000 years ago, while cannabis has been used in China and North Africa in the 1st century for its intoxicating properties. Bengali is also used. Tobacco leaves were also used for the same purpose.
Indigenous peoples of Australia have made great strides in the use of plants around them. Their isolation proves that their medicine was made for a much less deadly disease, they were not familiar with Western diseases. River mint, eucalyptus and wattle were used for colds, coughs, fevers, diarrhea and headaches.