Original sentence: Home Page for Viagra and prescribing information (PDF).It is awaiting FDA approval.PDE5 inhibitors:.PMID 9935041.Pfizer Pharmaceutical (Company website) - manufacturer of Viagra;.Some blood tests are generally done to exclude underlying disease, such as diabetes, hypogonadism and prolactinoma.The experimental drug PT-141 does not act on the vascular system like the former compounds but increases sexual desire and drive in male as well as female.The prescription PDE5 inhibitors sildenafil (Viagra®), vardenafil (Levitra®) and tadalafil (Cialis®) are prescription drugs which are taken orally.Various antihypertensives (medications intended to control high blood pressure) or to modify central nervous system response may inhibit erection by denying blood supply or by altering nerve activity.cGMP causes the smooth muscle of the arteries in the penis to relax, allowing the corpus cavernosum to fill with blood
Edited sentence: (Medline abstract) (Full text).Home Page for Viagra.Pfizer Pharmaceutical (Company website) - manufacturer of Viagra; prescribing information available in PDF format.Some blood tests are generally done to exclude underlying disease.Studies have shown that male circumcision may result in an increased risk of impotence (Palmer).The new drug PT-141 does not act on the vascular system like the former compounds but increases sexual desire and drive in male as well as female.The prescription PDE5 inhibitors Sildenafil (Viagra), Vardenafil (Levitra) and Tadalafil (Cialis) are prescription drugs which are taken orally.This has also been verified in China.Time will tell how history will rate the current advertising campaigns by Viagra, Cialis, Levitra and Enzyte.Today the medium of television is being used for that same purpose.Various medications intended to control blood pressure or to modify central nervous system response, may inhibit erection by denying blood supply or by altering nerve activity.cGMP causes the smooth muscle of the penis to relax, allowing the corpus cavernosum to fill with blood