Radiation treatment can cause both bladder and bowel incontinence. It can also lead to impotence, although that effect does not take place immediately. Dr. Hugh Taylor, director of the division of reproductive endocrinology and infertility at Yale University School of Medicine, said the findings are "very suggestive" but do not prove cause and effect. buy Viagra 50mg here 50mg viagra online without prescription Do you have Erectile Dysfunction? canadian pharmacy viagra for sale online Do you have Erectile Dysfunction? canadian pharmacy viagra for sale online TABLE 5 Multi-isoform inhibitors and secondary targets of selective inhibitors Although many inhibitors are called “selective”, this is really a relative term. The compounds are termed selective based on the fact that other isoforms are only inhibited at higher concentrations. Some compounds such as dipyridamole and zardaverine are selective for a limited number of isoforms. However, some of the inhibitors that target multiple isoforms may be useful because of this property. For example, dipyridamole is a component of the stroke treatment Aggrenox (aspirin/extended-release dipyridamole). Penile biothesiometry: This test involves the use of electromagnetic vibration to determine sensitivity and nerve function. A decreased sensitivity to these vibrations may indicate nerve damage. Erectile dysfunction. A vasodilator such as prostaglandin E1 can be injected into one of the corpora cavernosa. If the blood vessels are capable of dilating, a strong erection should develop within 5 minutes. A tourniquet may be used if a venous leak is present that would produce difficulty in maintaining an erection.