While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. It’s available in 50 mg, mg, and mg tablets. We considered cost, medications available, and whether generic versions were offered to help reduce costs. Still other online pharmacies specialize in medications for only a select few health concerns or conditions. Never purchase ED medications from a site or service that doesn’t require a prescription and medical documentation. There are many safe, reliable online services offering ED prescriptions.The basic cost of Levitra is approximately: Brand name: $ to $1, for ten to thirty 10 mg tablets. Generic: $ to $ for ten 10 mg tablets. But your out-of . You may already know most of the names: Cialis, Levitra, Staxyn, Stendra, Viagra. Learn more about these medications that can help men with erectile dysfunction get and keep . Viagra, Cialis, Levitra, and Stendra are oral medications used to treat erectile dysfunction (ED). You may also know them by their generic names: sildenafil .