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How Common Is Erectile Dysfunction? Failure to achieve an erection less than 20% of the time is not unusual and treatment is rarely needed. Failure to achieve an erection more than 50% of the time, however, generally indicates there is a problem requiring treatment. buy propecia online buy propecia online buy propecia online buy cialis online online buy cialis online What causes erectile dysfunction? There are several causes which tend to be grouped into those that are mainly physical and those that are mainly psychological. Drug therapy for erectile dysfunction: One drug in particular, sildenafil (‘Viagra’), has become an international phenomenon since its launch in the late 1990s because it’s one of the first drugs to offer a relatively simple safe drug treatment that helps the majority of men with erectile dysfunction – at least 70 per cent report improved erections. The drug does not directly give a man an erection but it works by boosting the natural mechanism that leads to an erection. When a man is sexually aroused, certain tissues in his penis relax, allowing blood to flow in and fill the penis. Viagra helps by elevating the levels of the chemical that causes the tissues to relax. These effects were discovered accidentally. The drug was originally developed to improve blood supply to the heart in angina sufferers. A useful and simple way to distinguish between physiological and psychological impotence is to determine whether the patient ever has an erection. If never, the problem is likely to be physiological; if sometimes (however rarely), it could be physiological or psychological. The current diagnostic and statistical manual of mental diseases (DSM-IV) has included a listing for impotence. viagra online insurance buy viagra A psychosocial examination using an interview and questionnaire may reveal psychological factors contributing to erectile dysfunction. The sexual partner also may be interviewed to determine expectations and perceptions encountered during sexual intercourse. online prescription cialis with discounts buy cialis 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. What is normal penis anatomy? The penis contains two chambers, called the corpora cavernosa, which run the length of the upper side of the penis (see figure 1 below). The urethra, which is the channel for urine and ejaculate, runs along the underside of the corpora cavernosa. Filling the corpora cavernosa is a spongy tissue consisting of smooth muscles, fibrous tissues, spaces, veins, and arteries. A membrane, called the tunica albuginea, surrounds the corpora cavernosa. Veins located in the tunica albuginea drain blood out of the penis. buy viagra online url viagra online best price generic viagra online prescription buy viagra