Beside psychotherapy, a wide range of medication is used in the treatment of mental disorders. The first drugs used for this purpose were extracted from plants with psychoactive properties. Louis Lewin, in 1924, was the first one to introduce a classification of drugs and plants that had properties of this kind. The history of the medications used in mental disorders has developed a lot through years. The discovery of modern drugs prevailed during the 20th century. Lithium, a mood stabilizer, was discovered as a treatment of mania, by John F. Cade in 1949, "and Hammond (1871) used lithium bromide for 'acute mania with depression'". In 1937, Daniel Bovet and Anne-Marie Staub discovered the first antihistamine. In 1951 Paul Charpentier synthesized chlorpromazine an antipsychotic. Influences There are numbers of practitioners who have influenced the treatment of modern mental disorders. One of the most important among them was Benjamin Rush. Benjamin Rush (1746–1813) was considered the Father of American Psychiatry for his many works and studies in the mental health field. He tried to classify different types of mental disorders, he theorized about their causes, and tried to find possible cures for them. Rush believed that mental disorders were caused by poor blood circulation, though he was wrong. He also described Savant Syndrome and had an approach to addictions. Other important early psychiatrists include George Parkman, Oliver Wendell Holmes Sr., George Zeller, Carl Jung, Leo Kanner, and Peter Breggin. George Parkman (1790–1849) got his medical degree at the University of Aberdeen in Scotland. He was influenced by Benjamin Rush, who inspired him to take interest in the state asylums. He trained at the Parisian Asylum. Parkman wrote several papers on treatment for the mentally ill. Oliver Wendell Holmes Sr.(1809–1894) was an American Physician who wrote many famous writings on medical treatments. George Zeller (1858–1938) was famous for his way of treating the mentally ill. He believed they should be treated like people and did so in a caring manner. He banned narcotics, mechanical restraints, and imprisonment while he was in charge at Peoria State Asylum. Peter Breggin (1939–present) disagrees with the practices of harsh psychiatry such as electroconvulsive therapy. Psychotherapy A form of treatment for many mental disorders is psychotherapy. Psychotherapy is an interpersonal intervention, usually provided by a mental health professional such as a clinical psychologist, that employs any of a range of specific psychological techniques. There are several main types.