Potassium arsenite
Encyclopedia
Potassium arsenite is the compound which forms the basis of Fowler's solution
and is used as a specific rodenticide. It is toxic in humans.
Fowler's solution
Fowler's solution is a solution containing potassium arsenite that once was prescribed as a remedy or a tonic. A Dr. Fowler of Stafford, England proposed its use in 1786 as a substitute for a patent medicine, "tasteless ague drop." It was prescribed in the United States until the late 1950s for a...
and is used as a specific rodenticide. It is toxic in humans.