Viagra Canadian Pharmacy Return to top Half the men were assigned to receive 2 Gray (Gy -- a measurement of radiation) in 38 sessions spread over seven and a half weeks. ANSWER: Erectile dysfunction (ED), or impotence, refers to the persistent or recurrent inability to achieve or maintain an erection. It is a common condition with 52 percent of men aged 40-70 reporting some degree of impotence or erectile dysfunction. Psychotherapy and behavior modifications in selected patients are considered next if indicated, followed by oral or locally injected drugs, vacuum devices, and surgically implanted devices. In rare cases, surgery involving veins or arteries may be considered. Duplex ultrasound Monitoring erections that occur during sleep (nocturnal penile tumescence) can help rule out certain psychological causes of ED. Healthy men have involuntary erections during sleep. If nocturnal erections do not occur, then ED is likely to have a physical rather than psychological cause. Tests of nocturnal erections are not completely reliable, however. Scientists have not standardized such tests and have not determined when they should be applied for best results. Dr. Clete Kushida, president of the American Academy of Sleep Medicine, which publishes the journal Sleep, told Reuters Health the study relies on sound reasoning and is generally well done. However, echoing Pollm?cher's critique, he notes that the criteria of restless legs syndrome changed after the 2002 survey, which could affect how meaningful the results are. A health treatment that is not classified as standard Western medical practice is referred to as "alternative" or "complementary." Alternative treatments include nutritional supplements, herbal remedies, and acupuncture. Reviewed by Brunilda Nazario, MD The cause of erectile dysfunction is generally due to one of two factors; the cause can be psychological or physical. PDE-5 selective inhibitor. Inhibition of PDE-5 increases cGMP activity, which increases vasodilatory effects of NO. Effective in men with mild-to-moderate ED. Take on an empty stomach approximately 1 h before sexual activity. Sexual stimulation is necessary to activate response. The increased sensitivity for erections may last 24 h. Available as 25-, 50-, and 100-mg tablets. Onset of action varies from 15-60 min, with a duration of action of 4-6 h. Half-life is 4-5 h. Often times the breakdown or damage in the sequence affects the arteries, muscles, and surrounding tissues of the penis, and this breakdown is most commonly the result of a disease. Diseases that commonly cause ED include: Tests that may be done include: What is erectile dysfunction? The first step to overcoming these feelings is to acknowledge the problem and communicate honestly and openly with each other.