People taking nitrates like nitroglycerin Nitrostat or isosorbide mononitrate Imdur should not take PDE5 inhibitors, as doing so could result in a dangerous drop in blood pressure. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. Now, the Drug Enforcement Agency DEA has proposed new rules that will require an in-person visit for anything more than a day supply of controlled substances to be filled by an online pharmacy. It’s available in 25 mg, 50 mg, and mg tablets and lasts up to 18 hours. We considered cost, medications available, and whether generic versions were offered to help reduce costs.$12 View other PDE5 Inhibitors Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, . Levitra Prices, Coupons and Patient Assistance Programs. Levitra is a member of the impotence agents drug class and is commonly used for Erectile Dysfunction. The cost for . Generic: $ to $ for ten 10 mg tablets But your out-of-pocket cost for Levitra may depend on a few different factors that can drop these costs significantly, .