Calamus is a plant. The root (rhizome) is used to make medicine.
Despite safety concerns, calamus is used for gastrointestinal (GI) problems including ulcers, inflammation of the stomach lining (gastritis), intestinal gas (flatulence), upset stomach and loss of appetite (anorexia). Calamus is also used as a calming medicine (sedative), to induce sweating, and to treat rheumatoid arthritis and stroke.
Some people chew calamus to remove the smell of tobacco, as a stimulant, to increase their sense of well-being, and as a hallucinogen.Some people apply calamus directly to the skin to treat certain skin diseases. In foods, calamus is used as a spice.