Popular ED medications found online include: Viagra sildenafil : As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before sexual intercourse to help achieve and maintain an erection. Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours. They have the same benefits and risks as their brand-name counterparts. All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. This increase in blood flow results in a firmer, longer-lasting erection. More serious side effects may include a drop in blood pressure or an erection that lasts longer than four hours. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction.AdGet Deals and Low Prices On ed cures pills At Amazon. Grab Exciting Offers and Discounts On an Array Of Products From Popular test1.ru has been visited by 1M+ users in the past month. AdSay Goodbye to Performance Anxiety and Hello to Improved Sexual Stamina! Trust Our Unbiased Reviews and Improve Your Sexual Health in Confidence!Honest & Unbiased Reviews · Over 20 Years Online · Over Products Tested. AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping AvailableFree Shipping · Real Doctors · Discreet Packaging · Personalized Plan.