Published March 2, 1989.
List of German Commission E Monographs (Phytotherapy)
Cynoglossi herba, hound's tongue.
Hound's Tongue herb consists of the above-ground parts of Cynoglossum officinale L. (syn. C. clandestinum Desfontaines) [Fam. Boraginaceae], as well as preparations thereof.
Preparations of Hound's Tongue are used as an antidiarrheal and an expectorant.
Fixed combinations containing Hound's Tongue are used for ailments and complaints of the gastrointestinal tract, infections, skin diseases, and bronchitis; and externally for diseases and painful discomfort of extremities, myalgia, neuralgia, trauma, nervous diseases, and care of scar tissue.
The effectiveness of the herb for the claimed applications is not documented.
Hound's Tongue contains large amounts of the hepatotoxic pyrrolizidine alkaloids.
Since the effectiveness for the claimed applications is not documented, a therapeutic administration cannot be justified due to the risks.