This increase in blood flow results in a firmer, longer-lasting erection. Psychological factors like stress, depression, or anxiety can also contribute. We know things can change. Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours. According to the FDA, generic medications contain the same active ingredients as brand names, meaning there’s no difference in effectiveness or safety.AdGet a Prescription for ED treatment, discreetly deliverED to your test1.ruive Offers · How It Works · Get More InfoBrands: Sildenafil, Tadalafil, Get Started, Order Now and more. AdSave Time & Money with Online Prescription for Viagra, Cialis, Sildenafil and Tadafil. Free & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped Discreetly.