Metamucil is a fiber supplement. Introduced in 1934 by G. D. Searle & Company, Metamucil was acquired by Procter & Gamble in 1985.
The name is a combination of the Greek word for change and the class of fiber that it utilizes.
Metamucil is used to treat constipation.
Taking metamucil increases the bulk in your stool, an effect that helps to cause movement of the intestines.
Metamucil also works by increasing the amount of water in the stool, making the stool softer and easier to pass.