Oak bark (Quercus cortex)

Published February 1, 1990.
List of German Commission E Monographs (Phytotherapy)


Name of Drug

Quercus cortex, oak bark.

Composition of Drug

Oak bark consists of the dried bark of young branches and saplings of Quercus robur L. and/or Q. petraea (Mattuschka) Lieblein [Fam. Fagaceae], harvested in the spring, as well as their preparations in effective dosage.

The drug contains tannins.



Inflammatory skin diseases. Internal:

Nonspecific, acute diarrhea, and local treatment of mild inflammation of the oral cavity and pharyngeal region, as well as genital and anal area. Contraindications Internal:

None known. External:

Skin damage over a large area. Baths:

Full baths should not be taken, regardless of the active ingredients in the bath, under the following conditions:

weeping eczema and skin damage covering a large area; febrile and infectious diseases; cardiac insufficiency stages III and IV (NYHA); hypertonia state IV (WHO). Side Effects None known.

Interactions with Other Drugs


None known. Internal:

The absorption of alkaloids and other alkaline drugs may be reduced or inhibited. Dosage Unless otherwise prescribed:

Daily dosage:

3 g of drug; equivalent preparations. For rinses, compresses and gargles:

20 g drug per 1 liter of water; equivalent preparations. For full and partial baths:

5 g drug per 1 liter of water; equivalent preparations. Mode of Administration Comminuted herb for decoctions and other galenical preparations for internal and topical use.

Duration of Administration

If diarrhea persists longer than 3 - 4 days, a physician must be consulted.

Other areas of application:

Not more than 2 - 3 weeks. Actions Astringent