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Ginkgo Biloba Leaf Extract
Ginkgo folium
Ginkgo biloba bltter
Published July 19, 1994;
Name of Drug

Dry extract (35 - 67:1) from Ginkgo biloba L.  leaf [Fam.  Ginkgoaceae], extracted with acetone/water.  Active Ingredient Classification ASK No.  05939.  

Composition of Drug

A dry extract from the dried leaf of Ginkgo biloba L.  manufactured using acetone/water and subsequent purification steps without addition of concentrates or isolated ingredients.  

The drug/extract ratio is 35 - 67:1, on average 50:1.  

The extract is characterized by:

22 - 27 percent flavonone glycosides, determined as quercetin and kaempferol, including isorhamnetin (via HPLC) and calculated as flavones with a molar mass of MMr = 756.7 (quercetin glycosides) and Mr = 740.7 (kaempferol glycosides); 5 - 7 percent terpene lactones, of which approximately 2.8 - 3.4 percent consists of ginkgolides A, B, and C, as well as approximately 2.6 - 3.2 percent bilobalide; below 5 ppm ginkgolic acids.  

The given ranges include manufacturing and analytical variances.  

Pharmacological Properties, Pharmacokinetics, Toxicology
The following pharmacological effects have been established experimentally: Improvement of hypoxic tolerance, particularly in the cerebral tissue.  Inhibition of the development of traumatically or toxically induced cerebral edema, and acceleration of its regression.  Reduction of retinal edema and of cellular lesions in the retina.  Inhibition in age-related reduction of muscarinergic cholinoceptors and 2-adrenoceptors as well as stimulation of choline uptake in the hippocampus.  Increased memory performance and learning capacity.  Improvement in the compensation of disturbed equilibrium.  Improvement of blood flow, particularly in the region of microcirculation.  Improvement of the rheological properties of the blood.  Inactivation of toxic oxygen radicals (flavonoids).  Antagonism of the platelet-activating factor/PAF (ginkgolides).  Neuroprotective effect (ginkgolides A and B, bilobalide).   The pharmacokinetics have been investigated both in animal experiments and in trials involving humans.  An absorption rate of 60 percent was found in rats for a radioactively labeled extract (as specified under

(a) For symptomatic treatment of disturbed performance in organic brain syndrome within the regimen of a therapeutic concept in cases of demential syndromes with the following principal symptoms:

Memory deficits, disturbances in concentration, depressive emotional condition, dizziness, tinnitus, and headache.  

The primary target groups are dementia syndromes, including primary degenerative dementia, vascular dementia, and mixed forms of both.  

Note: Prior to starting treatment with ginkgo extract, clarification should be obtained as to whether the pathological symptoms encountered are not based on an underlying disease requiring a specific treatment.  

(b) Improvement of pain-free walking distance in peripheral arterial occlusive disease in Stage II of Fontaine (intermittent claudication) in a regimen of physical therapeutic measures, in particular walking exercise.  

(c) Vertigo and tinnitus (ringing in the ear) of vascular and involutional origin.  

Contraindications

Hypersensitivity to Ginkgo biloba preparations.  

Side Effects

Very seldom stomach or intestinal upsets, headaches, or allergic skin reaction.  

Interactions with Other Drugs

No restrictions known.  

Usage During Pregnancy

None known.  

Dosage And Administration

Unless otherwise prescribed:

Daily dosages:

Indication (a):

  • 120 - 240 mg native dry extract in 2 or 3 doses.  

Dosage
and Administration

Unless otherwise prescribed:

Daily dosages:

Indication (a):

  • 120 - 240 mg native dry extract in 2 or 3 doses.  

Overdosage
None known.
Special Cautions

None known.  

Special Warnings

None.  

Effects on Operators of Vehicles and Machinery
None known.
Mode of Administration

In liquid or solid pharmaceutical forms, for oral intake.  

Duration of Administration

Indication (a):

  • Length of administration should be judged according to the severity of symptoms and should extend at least 8 weeks in the case of chronic illness.  

Administration for more than 3 months should be reviewed as to justification for continued administration.  

Indication (b):

  • Improvement of ambulatory range requires administration for not less than 6 weeks.  

Indication (c):

  • Administration for more than 6 - 8 weeks has no therapeutic benefit.  

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as Ginkgo Biloba Leaf Extract
Approved Herbs with Similar Side Effects
as Ginkgo Biloba Leaf Extract
Approved Herbs with Similar Pharmacological Actions
as Ginkgo Biloba Leaf Extract