This section is from the book "Botanic Drugs Their Materia Medica, Pharmacology and Therapeutics", by Thomas S. Blair. Also available from Amazon: Botanic Drugs, Their Materia Medica, Pharmacology and Therapeutics.
Bearberry, Arclostaphylos uva-ursi. Almost universally official. Contains arbutin, q. v., as well as ericolin, ursone, and tannic and gallic acids. It is one of the Ericaceae and partakes of their common properties, for a discussion of which see "Epigeae" and "Chimaphila."
Uva ursi is tonic, astringent, a positive diuretic, and, to a degree, a urinary antiseptic.
Used similarly to buchu and chimaphila in the treatment of pyelitis, cystitis, urethritis, ardor urinae, and, in general, as a diuretic.
Manzanita, Arctostaphylos glauca, which grows in the mountains of California, has similar properties.
The extract of uva ursi is given in doses of 5 to 15 grains; it is not official. The fl. is given in an average dose of 30 minims.