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Vardenafil is a PDE₅ inhibitor used for treating erectile dysfunction that is sold under the brand name Levitra among others. . Nov 07, · It contains the same active ingredient as Levitra and can begin working in about 15 minutes. Viagra takes around 30 minutes to become effective and lasts about 4 hours. The expiration date was extended in after a settlement was reached between the manufacturer of Cialis, Eli Lilly and Compa. The patent for Cialis will expire on September 27, at the earliest. Viagra (sildenafil), 30 minutes–4 hours before sex, but preferably 60 minutes before, 50 mg maximum once daily ; Cialis (tadalafil), daily, at. If appropriate, get a prescription for ED from Rex MD. Free & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped Discreetly. You may also know them by their generic names: sildenafil (Viagra) tadalafil (Cialis) vardenafil. Viagra, Cialis, Levitra, and Stendra are oral medications used to treat erectile dysfunction (ED). The effects of both drugs last for about 4 hours. Levitra does have fewer common side effects than Viagra, and. Viagra can take 30 to 60 minutes to work in the body, while Levitra takes 60 minutes. Get started now. Get your free & private online visit todayReal Doctors · Discreet Packaging · Personalized Plan · Free Shipping/5 (2, reviews). AdWith RexMD you’re saving time and money with our ED delivery. Reliable E.D. meds prescribed by real doctors. These drugs work by blocking the PDE5. Viagra, Cialis, Levitra, and Stendra are all in a class of medications called phosphodiesterase type 5 (PDE5) inhibitors. If you buy through links on this pag. Viagra, Cialis, Levitra, and Stendra are oral medications for treating erectile dysfunction. Check out side-by-side comparisons of all four drugs. We include products we think are useful for our readers.