Based on a projection from the National Census conducted in , its population was estimated to be around , with the male to female ratio estimated to be around 1. Proper Use Use sildenafil exactly as directed by your doctor. It is not known if the medicine is safe for use in these patients. The amount of medicine that you take depends on the strength of the medicine. Users should also be aware of the impact of using sildenafil concomitantly with other illicit drugs and advised to use it when it is only necessary to avoid its addiction and minimize adverse effects.Generic sildenafil is covered by most Medicare and insurance plans, but some pharmacy coupons or cash prices may be lower. Get sildenafil for as low as $, which is 95% off the average retail price of $ for the most common version, by . The usual dose is 50mg, when you need it. Do not take it more than once a day. The dose can be increased to mg or decreased to 25mg depending on its effect. Take sildenafil up to 4 hours before you want to have sex. For sildenafil to work properly, you’ll need to be sexually excited. $ E S Main St.