Silverweed
Silverweed
Botanical Description & Habitat
Potentilla anserina
Family
Rosaceae
Common names
Cinquefoil Crampweed Goose tansy Goosegrass Moor grass Silver cinquefoil
Habitat
Common plant found in dry fields, meadows, and pastures in North America and Europe.
Description
Has a perennial, branched rootstock that produces rooting numbers. Basal leaves also arise from the rootstock; they are pinnate and divided into oblong, serrate leaflets having toothed margins. The leaves are dark green on top with silvery hairs on the underside. Bright yellow flowers grow on long, leafless stalks from May to September.
Medicinal parts
Whole plant, dried, collected just after flowering.Historical Properties & Uses
Silverweed is specifically used as an intestinal antispasmodic. Due to its high tannin content, the herb has also found use as an astringent to combat diarrhea. Herbalists recommend it be used in a mixture with other herbs, such as balm and chamomile.
Method of Action
The tannin content of silverweed account for its astringent and antidiarrheal properties. Its antispasmodic property has not been experimentally investigated.
Drug Interactions & Precautions
Possible Interactions
Silverweed should be used with caution in conjunction with CNS depressants or stimulants.
Certain antipsychotic drugs, (e.g., the phenothiazines), as well as other psychoactive agents which are poorly absorbed in the gastrointestinal tract, may be even more poorly absorbed if silverweed is being used.
The topical application of this astringent herb, in conjunction with the acne product tretinoin (retinoic acid, vitamin A acid), may adversely affect the skin.
The tannin in silverweed may potentiate the antibiotic activity of echinacea. The tannin in tea made from the herb may be inactivated by the addition of milk or cream.Safety Factors & Toxicity
The toxicity level of silverweed has not been determined at this time.
Preparation & Administration
Three times a day
Dried rhizome
1-3 grams
Tea
made from 1/2 tsp of dried rhizome
Tincture
1:5 in 45% alcohol, 2-4 ml
Note: This Herbal Preparation information is a summary of data from books and articles by various authors. It is not intended to replace the advice or attention of health care professionals.References
Am Hospital Formulary Service. Am Soc of Hosp Pharm. Wash, D.C.
Bressler, R., M.D. Bogdonoff & G.J. Subak-Sharpe. 1981. The Physicians Drug Manual. Doubleday & Co, Inc. Garden City, NY. 1213 pp.
Committee on Pharmocopaeia of Am Institute of Homeopathy, Homeopathic Pharmacopaeia of the U.S. 8th ed., Vol 1. Otis Clapp & Son. Boston, l981.
Fann, W.E. 1973. Chlorpromazine: effects of antacids on its gastrointestinal absorbtion. J of Clin Pharm, 13(10). pp. 388-90.
Fann, W.E., et.al. 1973. The effects of antacids on the blood levels of chlorpromazine. Clin Pharmacology and Therapeutics, 14(1-2). p. 135.
Goodman, L.S. & A. Gilman. 1975. Pharm Basis of Thera. MacMillan, NY.
Hansten, P.D. 1979. Drug Interactions, 4th ed. Lea & Febiger, Phila. Hyde. British Herbal Pharmacopoeia. Brit Herb Med Assoc: England, 1983
Kastrup, E.K., ed. 1981. Drug Facts and Comparisons, 1982 edition. Facts and Comparisions Division, J.P. Lippincott Co, Phila(St. Louis).
List, P. & L. Hoerhammer. 1969-1976. Hagers Hanbuch der Pharmazeutischen Praxis, vols. 2-5. Springer-Verlag, Berlin.
Martin, E.W. 1978. Drug Interactions Index, 1978. Lippincott Co, Phila.
Mowrey, Daniel B., Ph.D. Exper. Psych., Brigham Young University. Director of Nebo Institute of Herbal Sciences. Director of Behavior Change Agent Training Institute. Director of Research, Nova Corp.
Scientific Committee, British Herbal Pharmocopaeia, British Herbal Med Assoc, Lane House, Cowling, Na Keighley, West Yorks, Bd Bd220lx, l983.
Vincent, D. & G. Segonzac. 1953. Comptes Rendus des Seances de la Societe de Biologie et de ses Filiales, 147. pp. 1776-1779.
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