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Harpagophytum
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Lamiales
Family: Pedaliaceae
Genus: Harpagophytum

Harpagophytum procumbens, also called grapple plant, wood spider and most commonly Devil's Claw, is a plant of the sesame family, native to South Africa. It got its name from the peculiar appearance of its hooked fruit. The plant's large tuberous roots are used medicinally to reduce pain and fever, and to stimulate digestion. European colonists brought Devil's Claw home where it was used to treat arthritis.

H. procumbens are mainly found in the eastern and south eastern parts of Namibia, Southern Botswana and the Kalahari region of the Northern Cape, South Africa. H. Zeyheri is found in the northern parts of Namibia (Ovamboland) and southern Angola. The active ingredient is harpagoside (structure at PubChem [1]) with values ranging in both species from 1.0% to 3.3%.

The name "devil's claw" is also used for several species of North American plants in the genus Proboscidea, as well as Urtica dioica.

Contents

Medicinal Uses

beta-sitosterol is one of the active constituents of Devil's Claw

The two active ingredients in Devil's Claw are harpagoside and beta-sitosterol. It is claimed that these possess anti-inflammatory properties. The British Herbal Pharmacopoeia recognises Devil's Claw as having analgesic, sedative and diuretic properties. Most studies involve chronic use rather than acute treatment of pain.

Devil's Claw is also claimed to be beneficial for treating diseases of the liver, kidneys, gallbladder and bladder, arthritis and rheumatism. It is said to help alleviate problems with and improve the vitality of the joints, as well as stimulating appetite and aid digestion, increase cholesterol and fatty acids in the blood. Devil's Claw has been recommended for treating diabetes, hardening of the arteries, lumbago, gastrointestinal disturbances, menstrual difficulties, neuralgia, headache, heartburn and gout.[1]

Several studies have been performed using Doloteffin, a standardized preparation of Devil's Claw.[2] A series of small-scale studies completed in Germany found that H. procumbens was indistinguishable from Vioxx in the treatment of chronic low back pain,[3] and was well-tolerated after more than four years of treatment of H. procumbens alone.[4] H. procumbens also seems efficacious in the treatment of arthritis-caused hip and knee pain. An author involved in several studies on Devil's Claw and pain relief had the general conclusion that a minimum 50 mg per dose standardized extract was an alternative to synthetic analgesics with a low risk of adverse events.[5] A separate 2006 systematic review of herbal medications for low back pain reached the conclusion that a standardized daily dose between 50 and 100 mg of harpagoside performed better than a placebo, and an unspecified dose of harpagoside demonstrated relative equivalence to 12.5 mg per day of Vioxx.[6]

Devil's claw can also be used externally to treat sores, ulcers, boils and skin lesions.

Adverse reactions

Devil's claw may interfere with the action of Ticlopidine and Warfarin, and patients should consult with a physician before combining Devil's claw with these medications. In addition, Devil's Claw promotes the secretion of stomach acid, leading to difficulties in those with peptic ulcers, gastritis or excess stomach acid. Care should also be taken for individuals with gallstones.

Notes

  1. ^ Applied health article on Devil's Claw
  2. ^ Due to the natural variability of herbal extracts, the results of studies using different products and preparations are difficult to compare
  3. ^ Chrubasik S, Model A, Black A, Pollak S (January 2003). "A randomized double-blind pilot study comparing Doloteffin and Vioxx in the treatment of low back pain". Rheumatology (Oxford) 42 (1): 141–8. PMID 12509627. http://rheumatology.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=12509627.  
  4. ^ Chrubasik S, Künzel O, Thanner J, Conradt C, Black A (January 2005). "A 1-year follow-up after a pilot study with Doloteffin for low back pain". Phytomedicine 12 (1-2): 1–9. PMID 15693701.  
  5. ^ Chrubasik S (July 2004). "[Devil's claw extract as an example of the effectiveness of herbal analgesics]" (in German). Orthopade 33 (7): 804–8. doi:10.1007/s00132-004-0675-710.1007/s00132-004-0675-7. PMID 15150687.  
  6. ^ Gagnier JJ, van Tulder M, Berman B, Bombardier C (2006). "Herbal medicine for low back pain". Cochrane Database Syst Rev (2): CD004504. doi:10.1002/14651858.CD004504.pub310.1002/14651858.CD004504.pub3. PMID 16625605.  

References

External links


Wikispecies

Up to date as of January 23, 2010

From Wikispecies

Harpagophytum

Taxonavigation

Classification System: APG II (down to family level)

Main Page
Cladus: Eukaryota
Regnum: Plantae
Cladus: Angiospermae
Cladus: Eudicots
Cladus: core eudicots
Cladus: Asterids
Cladus: Euasterids I
Ordo: Lamiales
Familia: Pedaliaceae
Genus: Harpagophytum
Species: H. procumbens - H. zeyheri

Name

Harpagophytum DC. ex Meisn.








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