Featured Research

from universities, journals, and other organizations

Viagra Risks Cut Down By One As Study Finds Blood Flow In Eyes Unaffected By Sex Drive Drug

Date:
January 6, 2003
Source:
University Of California - Irvine
Summary:
When Viagra was introduced in 1999, the drug's manufacturer warned of a number of visual side effects, including possible nerve damage to the eyes. But a UC Irvine College of Medicine study rules out some of these risks -- even when the drug is taken in high doses.

Irvine, Calif. -- When Viagra was introduced in 1999, the drug's manufacturer warned of a number of visual side effects, including possible nerve damage to the eyes. But a UC Irvine College of Medicine study rules out some of these risks -- even when the drug is taken in high doses.

Related Articles


According to Dr. Tim McCulley, assistant professor of ophthalmology, blood flow in the eye does not seem to be reduced by even high doses of the popular erectile dysfunction drug. Since Viagra lowers blood pressure overall, there was persistent suspicion that the drug might cause decreased optical blood flow, which can cause nerve damage.

McCulley's study appears in the January 2003 issue of Ophthalmologica.

"Viagra can change blood vessel structure as well as general blood pressure, so we needed to answer the question whether the drug could change blood vessels in the eye," McCulley said. "Our study may have had a small group of participants, but it showed very little change in blood vessels or blood flow in nearly all the patients."

McCulley's team conducted the trial with 13 men at Stanford University and found that high doses of Viagra by and large preserved the thickness of the eye's choroids layer, which supplies the eyeball with blood. However, the team did find some small variations in thickness, which indicated that some people with underlying vascular diseases may indeed have changes in vision.

In addition, the researchers found no connection among blood flow choroid thickness and changes in color vision, a common side effect of taking Viagra.

McCulley's team confirmed these side effects, finding that Viagra users had a harder time discriminating among subtle changes in color. But they also found that Viagra users reported problems in picking out any number of colors, not just the blue-green variety reported during the drug's clinical trials.

###

A complete archive of press releases is available on the World Wide Web at http://www.today.uci.edu.


Story Source:

The above story is based on materials provided by University Of California - Irvine. Note: Materials may be edited for content and length.


Cite This Page:

University Of California - Irvine. "Viagra Risks Cut Down By One As Study Finds Blood Flow In Eyes Unaffected By Sex Drive Drug." ScienceDaily. ScienceDaily, 6 January 2003. <www.sciencedaily.com/releases/2003/01/030106082146.htm>.
University Of California - Irvine. (2003, January 6). Viagra Risks Cut Down By One As Study Finds Blood Flow In Eyes Unaffected By Sex Drive Drug. ScienceDaily. Retrieved April 19, 2015 from www.sciencedaily.com/releases/2003/01/030106082146.htm
University Of California - Irvine. "Viagra Risks Cut Down By One As Study Finds Blood Flow In Eyes Unaffected By Sex Drive Drug." ScienceDaily. www.sciencedaily.com/releases/2003/01/030106082146.htm (accessed April 19, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Sunday, April 19, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Our Love Of Puppy Dog Eyes Explained By Science

Our Love Of Puppy Dog Eyes Explained By Science

Newsy (Apr. 17, 2015) Researchers found a spike in oxytocin occurs in both humans and dogs when they gaze into each other&apos;s eyes. Video provided by Newsy
Powered by NewsLook.com
Dr. Oz Under Fire For 'Quack Treatments' Yet Again

Dr. Oz Under Fire For 'Quack Treatments' Yet Again

Newsy (Apr. 17, 2015) Ten doctors signed a letter urging Columbia University to drop Dr. Oz as vice chair of its department of surgery, saying he plugs "quack" treatments. Video provided by Newsy
Powered by NewsLook.com
Scientists Find Link Between Gestational Diabetes And Autism

Scientists Find Link Between Gestational Diabetes And Autism

Newsy (Apr. 17, 2015) Researchers who analyzed data from over 300,000 kids and their mothers say they&apos;ve found a link between gestational diabetes and autism. Video provided by Newsy
Powered by NewsLook.com
Video Messages Help Reassure Dementia Patients

Video Messages Help Reassure Dementia Patients

AP (Apr. 17, 2015) Family members are prerecording messages as part of a unique pilot program at the Hebrew Home in New York. The videos are trying to help victims of Alzheimer&apos;s disease and other forms of dementia break through the morning fog of forgetfulness. (April 17) Video provided by AP
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:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

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