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While erectile dysfunction can occur at any age, it is uncommon among young men and more common in the elderly. By age 45, most men have experienced erectile dysfunction at least some of the time. According to the Massachusetts Male Aging Study, complete impotence increases from 5% among men 40 years of age to 15% among men 70 years and older. Population studies conducted in the Netherlands found that some degree of erectile dysfunction occurred in 20% of men between ages 50-54, and in 50% of men between ages 70-78. In 1999, the National Ambulatory Medical Care Survey counted 1,520,000 doctor-office visits for erectile dysfunction. Other studies have noted that approximately 35% of men 40-70 years of age suffer from moderate to severe ED, and an additional 15% may have milder forms. In some cases, premature and inhibited ejaculation are caused by psychological factors, including a strict religious background that causes the person to view sex as sinful, a lack of attraction for a partner, and past traumatic events. Premature ejaculation, the most common form of sexual dysfunction in men, often is due to nervousness over how well he will perform during sex. Certain drugs, including some antidepressants, may affect ejaculation, as can nerve damage to the spinal cord or back. australian online viagra viagra buy cialis from canada How Are Male Sexual Problems Diagnosed? To diagnose a man's sexual problem, the doctor likely will begin with a thorough history of symptoms and a physical exam. He or she may order other tests to rule out any medical problems that may be contributing to the dysfunction. The doctor may refer you to other health professionals, including a urologist (a doctor specializing in the urinary tract and male reproductive system), sex therapist, and other counselors. How should vardenafil (Levitra) be administered? The recommended starting dose of vardenafil is 10 mg taken orally approximately one hour before sexual activity. The dose may be adjusted higher or lower depending on efficacy and side effects. The maximum recommended dose is 20 mg, and the maximum recommended dosing frequency is no more than once per day. Vardenafil can be taken with or without food. puchase propecia online buy propecia online What should I do if I develop persistent erectile dysfunction? It is best to see your GP. He or she is likely to discuss the problem, go over any medication you may be taking, and do a physical examination. This can help to identify, or rule out, possible underlying causes. Before treatment, your GP may suggest some tests. viagra cialis levitra online canadian rx buy cialis A recent study suggests an epidemiological association between chronic periodontitis (periodontal inflammation) and erectile dysfunction, similarly to the association between periodontitis and coronary heart diseases, and cerebrovascular diseases.[17] In all the three conditions (erectile dysfunction, coronary heart disease and cerebrovascular diseases), despite the epidemiological association with periodontitis, no causative connection has proved yet. Therefore, the dose and frequency of tadalafil has to be lowered in the following examples:No tadalafil dose adjustment is necessary for men with only mild kidney disease. Men with moderately severe kidney impairment should start tadalafil at 5 mg every 24 hours and not to exceed the maximum dose of 10 mg taken every 48 hours. In men with severe kidney disease and on dialysis, the maximum dose should not exceed 5 mg.