Iceland Moss (Lichen islandicus)

Published March 2, 1989.
List of German Commission E Monographs (Phytotherapy)

Isländisches Moos

Name of Drug

Lichen islandicus, Iceland moss.

Composition of Drug

Iceland moss consists of the dried thallus of Cetraria islandica (L.) Acharius s.l. [Fam. Parmeliaceae], as well as its preparations in effective dosage.

The herb contains mucilage and bitter principles.


(a) Irritation of the oral and pharyngeal mucous membranes and accompanying dry cough.

(b) Loss of appetite.


None known.

Side Effects

None known.

Interactions with Other Drugs

None known.


Unless otherwise prescribed:

Average daily dosage:

4 - 6 g of herb; equivalent preparations. Mode of Administration Use (a):

Comminuted herb for infusions and other galenical formulations for internal use. Use (b):

Comminuted herb, preferably for cold macerates and other bitter-tasting preparations for internal use. Actions Soothing
Mildly antimicrobial.