The most common symptoms of erectile dysfunction include difficulty achieving or maintaining an erection and reduced sexual desire. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. Other conditions that may disqualify you from an ED prescription include a history of stroke, kidney or liver disease, cancer, diabetes, or a bleeding disorder. More serious side effects may include a drop in blood pressure or an erection that lasts longer than four hours. It’s best to check your chosen provider’s site for more information. Our experts can discuss options with you, and adjust your treatment to fit around you.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 mints or pills. Prices range from $3 to $ per dose or $82 to $ for a monthly supply, depending on the medication. Extra 15% off $30 sitewide with code SAVE15; Clip your mystery deal! BOGO 50% off select Walgreens health & wellness. Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. This boosts blood flow and helps you get an erection from sexual activity. How oral medicines differ.