Urosolic acid

Related Terms

Arberry, arbusier (French), arbutin, Arbutus uva ursi, arctostaphylos, Arctostaphylos adenotricha, Arctostaphylos coactilis, Arctostaphylos coactylis, Arctostaphylos uva-ursi, arctuvan, barentraube (German), bearberry, bear grape, bear's grape, bearsgrape, beerendruif (Holland), bousserole (French), common bearberry, common beargrape, coralillo (Spanish), creeping manzanita, crowberry, Cystinol akut?, Dunih'tan (Carrier people), Ericaceae (family), foxberry, gayuba (Spanish), hog berry, hydroquinone, kanya'ni, kwica (American Indian), kinnikinnick (American Indian), macnicy (Polish), manzanita, mealberry, mehlberre (German), melbaerblad (Norweigan), melbarrisblade (Danish), methyl arbutin, mjolonrisblad (Swedish), mossberre (German), mountain box, mountain cranberry, phenolic glycoside, ptarmigan berry, raisin d'ours (French), redberry, red bearberry, rock berry, rockberry, sagsckhomi (American Indian), sand berry, sandberry, Solvefort, s'qaya'dats, tannin, toloknianka (Russian), upland cranberry, Uroflux, uva d'orso (Italian), UVA-E, Uvae ursi folium, Uvalyst, uva-ursi, uva ursi leaf, whortle berry, wilder Buchsbaum (German), Wolfstraube (German).

Background

Uva ursi (bearberry) is described as a small evergreen shrub with clusters of small white or pink bell-shaped flowers and dull orange berries. Although the berries do not seem to possess any medicinal benefits, the leaves have been used traditionally as an herbal remedy for mild, uncomplicated cystitis (inflammation of the bladder).
Grown throughout Asia, North America and Europe, uva ursi has a long history of medicinal use dating back to the 13th century. The leaves have been used worldwide as a diuretic, astringent, antiseptic and a treatment for urinary tract infections (UTIs). A tea brewed with the leaves has also been used as a laxative.
Arbutin, the main chemical constituent of uva ursi, is a phenolic glycoside that becomes hydrolyzed to hydroquinone. Both chemicals contribute to the antiseptic effects in the urinary tract. Arbutin alone has been reported to relieve pain from kidney stones, cystitis (bladder infection) and nephritis (kidney inflammation). However, due to its high tannin content, uva ursi may cause acute nausea and intestinal irritation.
Uva ursi leaf was listed on the U.S. National Formulary as a urinary antiseptic from 1820 to 1950 but it is no longer listed in the United States Pharmacopoeia. The European Scientific Cooperative on Phytotherapy (ESCOP) lists uva ursi as a treatment for uncomplicated cystitis where antibiotics are not warranted. The German Commission E Monographs recommend it for inflammatory conditions of the lower urinary tract.

Evidence Table

These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. GRADE *
These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. GRADE *


The chemical constituents of the herbal product uva ursi have been used for a variety of conditions such as chloasma, a skin condition that appears as a blotchy, brownish discoloration on the skin, especially the face. Females are usually targeted for the condition because it occurs as a result of oral contraception use, or during pregnancy or menopause. The clinical usefulness of uva ursi has not been well established in the current literature.

C


The chemical constituents of the herbal product uva ursi have been used for a variety of conditions such as chloasma, a skin condition that appears as a blotchy, brownish discoloration on the skin, especially the face. Females are usually targeted for the condition because it occurs as a result of oral contraception use, or during pregnancy or menopause. The clinical usefulness of uva ursi has not been well established in the current literature.

C


Uva ursi has long been used as a folk remedy to treat urinary tract infection. The active ingredients in the herb are believed to be ursolic acid and isoquercitrin. Additional study is needed to make a strong recommendation.

 C


Uva ursi has long been used as a folk remedy to treat urinary tract infection. The active ingredients in the herb are believed to be ursolic acid and isoquercitrin. Additional study is needed to make a strong recommendation.

 C
* Key to grades

A: Strong scientific evidence for this use
B: Good scientific evidence for this use
C: Unclear scientific evidence for this use
D: Fair scientific evidence for this use (it may not work)
F: Strong scientific evidence against this use (it likley does not work)
* Key to grades

A: Strong scientific evidence for this use
B: Good scientific evidence for this use
C: Unclear scientific evidence for this use
D: Fair scientific evidence for this use (it may not work)
F: Strong scientific evidence against this use (it likley does not work)

Tradition / Theory

The below uses are based on tradition, scientific theories, or limited research. They often have not been thoroughly tested in humans, and safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. There may be other proposed uses that are not listed below.

Dosing

Adults (18 years and older)
There is no proven safe or effective dose for uva ursi. Cystinol akut? is one brand that has been studied. A typical dose taken by mouth is 3 grams of uva ursi (or 400-800 milligrams of hydroquinone derivatives) steeped in water and taken as a tea, or taken in powder form, four times a day for inflammatory conditions. For urinary tract infection (UTI), 250-500 milligrams of uva ursi powdered extract (20% arbutin) has been taken three times a day (for no more than four days). When applied on the skin, a 2% or 5% hydroquinone cream has been used for hyperpigmentation. A topical preparation containing 3% arbutin (glycoside in uva ursi) over a 12-week period has also been used.

Safety

The U.S. Food and Drug Administration does not strictly regulate herbs and supplements. There is no guarantee of strength, purity or safety of products, and effects may vary. You should always read product labels. If you have a medical condition, or are taking other drugs, herbs, or supplements, you should speak with a qualified healthcare provider before starting a new therapy. Consult a healthcare provider immediately if you experience side effects.

Interactions

Interactions with Drugs
Uva ursi may increase the inhibitory effect of prednisolone on swelling. The arbutin in uva ursi may potentiate the effects of prednisolone and dexamethasone on contact dermatitis. Caution is advised when using uva ursi with corticosteroids (steroids).
Uva ursi may increase urine flow, and may interact with other agents that increase urine flow (diuretics).
The arbutin in uva ursi may increase the anti-inflammatory activity of indomethacin on contact dermatitis, hypersensitivity, and arthritis. Caution is advised when taking uva ursi with non-steroidal anti-inflammatory drugs (NSAIDs) due to theoretical interactions.
Concomitant use of uva ursi and urine acidifiers may result in decreasing the effects of uva ursi.
Concomitant use of uva ursi and products that can alkalinize the urine can enhance the antibacterial activity of uva ursi.

Attribution

This information is based on a systematic review of scientific literature edited and peer-reviewed by contributors to the Natural Standard Research Collaboration (www.naturalstandard.com).

Bibliography

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