Featured Research

from universities, journals, and other organizations

Antibiotic appears more effective than cranberry capsules for preventing urinary tract infections

Date:
July 26, 2011
Source:
JAMA and Archives Journals
Summary:
In premenopausal women who have repeated urinary tract infections, the antibiotic trimethoprim-sulfamethoxazole appeared more effective than cranberry capsules for preventing recurrent infections, at the risk of contributing to antibiotic resistance, according to a new report.

In premenopausal women who have repeated urinary tract infections (UTIs), the antibiotic trimethoprim-sulfamethoxazole (TMP-SMX) appeared more effective than cranberry capsules for preventing recurrent infections, at the risk of contributing to antibiotic resistance, according to a report in the July 25 issue of Archives of Internal Medicine, one of the JAMA/Archives journals.

Urinary tract infections are common in women, affecting nearly half at some point in their lives, according to background information in the article. The authors note that up to 30 percent of women develop recurrent UTIs (rUTIs), a condition for which a low-dose antibiotic is frequently used as a preventive measure. "However, this may lead to drug resistance not only of the causative microorganisms but also of the indigenous flora," write the authors. Studies of cranberries and cranberry products have shown some effectiveness in preventing rUTIs, but these trials have not compared those interventions directly with TMP-SMX, the standard antibiotic used in these cases.

Mariλlle A.J. Beerepoot, M.D., from the Academic Medical Center, Amsterdam, and colleagues conducted a double-blind noninferiority trial of cranberry capsules and TMP-SMX. The 221 participants were premenopausal adult women who had reported at least three symptomatic UTIs in the previous year. They were randomized to take either TMP-SMX (480 mg at night, plus one placebo capsule twice daily) or cranberry capsules (500 mg twice daily, plus one placebo tablet at night) for 12 months. Researchers assessed participants' clinical status once a month (and for three months after stopping the study medication) via urine and feces samples and a questionnaire; participants also submitted urine samples when they experienced UTI-like symptoms.

At 12 months, the average number of clinical recurrences was 1.8 in the TMP-SMX group and 4.0 in the cranberry capsules group. Recurrence occurred, on average, after eight months in the drug group and after four months in the cranberry capsules group. Antibiotic resistance rates tripled in the pathogens found in patients in the TMP-SMX group, although three months after the drug was discontinued, resistance rates returned to the levels they had been at when the study began.

The antibiotic used in this study appeared to be more effective at preventing rUTIs than cranberry capsules, but the researchers noted that achieving this result also seemed to increase the rate of antibiotic resistance. "From clinical practice and during the recruitment phase of this study, we learned that many women are afraid of contracting drug-resistant bacteria using long-term antibiotic prophylaxis and preferred either no or nonantibiotic prophylaxis," they report. "In those women, cranberry prophylaxis may be a useful alternative despite its lower effectiveness."

This study was supported by a grant from the Netherlands Organization for Health Research and Development. The authors received the cranberry and placebo capsules from Springfield Nutraceuticals BV, Oud Beijerland, the Netherlands.

Commentary: Cranberries as Antibiotics?

An accompanying commentary by Bill J. Gurley, Ph.D., from the University of Arkansas for Medical Sciences, Little Rock, evaluates the results obtained by Beerepoot and colleagues in the context of nonpharmacologic remedies. Botanical dietary supplements are not intended to be used to treat, cure or prevent disease, he writes, but "most U.S. consumers, however, have expectations of health benefits from the dietary supplements they consume." Nevertheless, supplements such as cranberry capsules may not demonstrate optimal efficacy due to issues with poor water solubility and the type of metabolism that occurs.

Dr. Gurley notes that the report by Beerepoot and colleagues has two important features. Given that one month into the study, antibiotic resistance for Escherichia coli was higher than 85 percent in the TMP-SMX group but less than 30 percent in the cranberry capsule group, "such a marked reduction in antibiotic resistance certainly favors the therapeutic potential of cranberry as a natural UTI preventative." Further, Gurley points out that TMP-SMX showed superior efficacy to cranberry capsules, but that the low rate of bioavailability of bacteria-fighting chemicals in the dosage used of the latter may have affected the study's results. "Because optimal doses have not been established for many botanicals, clinical efficacy trials have often yielded negative or inconclusive results," Gurley points out. He mentions an ongoing dose-ranging study for cranberry that may provide more information on this supplement's effectiveness.


Story Source:

The above story is based on materials provided by JAMA and Archives Journals. Note: Materials may be edited for content and length.


Journal References:

  1. M. A. J. Beerepoot, G. ter Riet, S. Nys, W. M. van der Wal, C. A. J. M. de Borgie, T. M. de Reijke, J. M. Prins, J. Koeijers, A. Verbon, E. Stobberingh, S. E. Geerlings. Cranberries vs Antibiotics to Prevent Urinary Tract Infections: A Randomized Double-blind Noninferiority Trial in Premenopausal Women. Archives of Internal Medicine, 2011; 171 (14): 1270 DOI: 10.1001/archinternmed.2011.306
  2. B. J. Gurley. Cranberries as Antibiotics?: Comment on "Cranberries vs Antibiotics to Prevent Urinary Tract Infections: A Randomized Double-Blind Noninferiority Trial in Premenopausal Women". Archives of Internal Medicine, 2011; 171 (14): 1279 DOI: 10.1001/archinternmed.2011.332

Cite This Page:

JAMA and Archives Journals. "Antibiotic appears more effective than cranberry capsules for preventing urinary tract infections." ScienceDaily. ScienceDaily, 26 July 2011. <www.sciencedaily.com/releases/2011/07/110725162517.htm>.
JAMA and Archives Journals. (2011, July 26). Antibiotic appears more effective than cranberry capsules for preventing urinary tract infections. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2011/07/110725162517.htm
JAMA and Archives Journals. "Antibiotic appears more effective than cranberry capsules for preventing urinary tract infections." ScienceDaily. www.sciencedaily.com/releases/2011/07/110725162517.htm (accessed July 30, 2014).

Share This




More Plants & Animals News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Rodents Rampant in Gardens Around Louvre

Rodents Rampant in Gardens Around Louvre

AP (July 29, 2014) — Food scraps and other items left on the grounds by picnickers brings unwelcome visitors to the grounds of the world famous and popular Louvre Museum in Paris. (July 29) Video provided by AP
Powered by NewsLook.com
Jane Goodall Warns Great Apes Face Extinction

Jane Goodall Warns Great Apes Face Extinction

AFP (July 29, 2014) — The world's great apes face extinction within decades, renowned chimpanzee expert Jane Goodall warned Tuesday in a call to arms to ensure man's closest relatives are not wiped out. Duration: 00:58 Video provided by AFP
Powered by NewsLook.com
How Your Face Can Leave A Good Or Bad First Impression

How Your Face Can Leave A Good Or Bad First Impression

Newsy (July 29, 2014) — Researchers have found certain facial features can make us seem more attractive or trustworthy. Video provided by Newsy
Powered by NewsLook.com
Rat Infestation at Paris' Tuileries Garden

Rat Infestation at Paris' Tuileries Garden

AFP (July 29, 2014) — An infestation of rats is causing concern among tourists at Paris' most famous park -- the Tuileries garden next to the Louvre Museum. Duration: 00:54 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins