Viagra generally only stays in your system for four to six hours. You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. An evaluation of visual function at doses up to twice the maximum recommended dose revealed no effects of VIAGRA on visual acuity, intraocular pressure, or pupillometry. Indeed, for many years there were no FDA-approved drugs for treating problems with sexual arousal or sexual desire in women. Similar values for pharmacokinetic parameters were seen in normal volunteers and in the patient population, using a population pharmacokinetic approach. There is also the option to take Cialis as needed. This, in turn, leads to more nitric oxide in the body.Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. Pickup Same Day Delivery Shipping Add to cart Extenze Extended Release Male Enhancement Supplement – 15 ea $ $ / ea$ Extra 15% off $30 Sitewid Out of stock at your store Check other stores Shipping Add for shipping. According to an article by the New York Post, the average cost of a mg Viagra pill is $40 at most U.S. pharmacies. The degree of variation from one pharmacy to another is marked by a few dollars. In the above table, the lowest price for a day supply of mg pills is $ at Walmart. At the other end of the scale Rite Aid members.