document.writeln('<b>How Levitra works</b><br>\
The active ingredient in Levitra works specifically on the chain of events that occur in the penis during arousal.<br><br>\
Levitra belongs to a class of drugs called "PDE-5 inhibitors." It works by increasing blood flow to the penis to improve erectile function.<br><br>\
In clinical trials, Levitra was shown to help men get and keep an erection for successful intercourse.<br><br>\
Levitra won\'t cause an embarrassing, instant erection. For most men, Levitra did not cause an erection for longer than they were sexually stimulated.<br><br>\
<b>Clinical proof that Levitra works</b><br>\
In an extensive clinical trial program that included more than 50 trials and involved more than 4,400 men with erectile dysfunction (ED), the results of one or more of these clinical trials showed:\
<ul>\
<li>Levitra provided first time success and reliable improvement of erectile function for many men.\
<li>In a broad patient population, Levitra helped up to 85% of men with erectile dysfunction achieve improved erections.\
<li>Men reported having harder erections and improved overall sexual experiences.\
<li>What\'s more, Levitra has been clinically shown to improve erectile function even in men who had other health factors, like diabetes or prostate surgery.\
</ul>\
Men taking nitrate drugs, often used to control chest pain (also known as angina), should not take Levitra. Men who use alpha-blockers, sometimes prescribed for high blood pressure or prostate problems, also should not take Levitra. Such combinations could cause blood pressure to drop to an unsafe level.');