All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. Never purchase ED medications from a site or service that doesn’t require a prescription and medical documentation. We also looked at additional services, such as access to digital pharmacies and home delivery options. Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours. The body takes longer to absorb it after a high-fat meal or alcohol. However, all medications come with risks. Your health information should remain between your provider and yourself.Depending on your symptoms and needs, you may be prescribed Viagra, sildenafil, Cialis, tadalafil, Stendra, paroxetine, or a combination of tadalafil and sildenafil, available as . Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles . 20 mg sildenafil oral tablet from $ for 10 tablets 25 mg sildenafil oral tablet from $ for 30 tablets 50 mg sildenafil oral tablet from $ for 15 tablets mg .