Fowler's solution consists of 1% potassium arsenite (KAsO2) in water and was first described and published as a potential treatment for malaria and syphilis in the late 1700s and was once also prescribed as a tonic. Thomas Fowler (1736–1801) of Stafford, England, proposed the solution in 1786 as a substitute for a patent medicine, "tasteless ague drop". It was known at the time as "Liquor Arsenicalis". From 1865, Fowler's solution was a leukemia treatment.
From 1905, inorganic arsenicals like Fowler's solution saw diminished use as attention turned to organic arsenicals, starting with Atoxyl.
↑Ho, Derek; Lowenstein, Eve J. (2016). "Fowler's Solution and the Evolution of the Use of Arsenic in Modern Medicine". Skinmed. 14 (4): 287–289. ISSN1540-9740. PMID27784519.