About 50 to 60 percent of women are diagnosed with a urinary tract infection (UTI) at least once during their lifetime. Many experience multiple recurrences. Cranberry juice, a popular home remedy for UTI, is often taken along with low-dose antibiotics as a preventive measure. Because little is known about the potential of cranberry juice to interact with drugs, NCCAM-funded researchers at the University of Washington studied cranberry’s effects on two antibiotics frequently prescribed for UTI: amoxicillin and cefaclor.
Source: http://nccam.nih.gov/research/results/spotlight/081009.htm?nav=rss