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Injury: Injuries to the pelvis, bladder, spinal cord, and penis that require surgery also commonly cause ED. "IUD" stands for "intrauterine device." An IUD is put in a woman's uterus by her doctor. It's made of flexible plastic. It isn't known exactly how IUDs prevent pregnancy. They seem to stop sperm from reaching the egg or prevent the egg from attaching to the uterus. Yes, but because these drugs work the same way, it's unlikely that you'll have success with one if you've failed to achieve an adequate erection with another. Here you can buy viagra without prescription 25mg viagra online without prescription ANTHONY J. VIERA, LT, MC, USNR Sildenafil (Viagra), whose labeling was approved by the U.S. Food and Drug Administration (FDA) in March 1998, is the first oral medication to be marketed for the treatment of erectile dysfunction. Sildenafil inhibits the conversion of cGMP to guanosine monophosphate in the corpus cavernosum, thereby increasing the available concentration of cGMP. This reaction is largely catalyzed by the enzyme phosphodiesterase type 5. Sildenafil inhibits this enzyme, resulting in relaxation of the cavernosal smooth muscle.17 Sildenafil is absorbed rapidly, with peak plasma levels achieved within an hour. It undergoes hepatic metabolism and has a half-life of about four hours.