Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. These medicines are called PDE5 inhibitors. Oral medicine for ED also might not be safe or work well if you have: Very low blood pressure, called hypotension, or uncontrolled high blood pressure, called hypertension. There are many safe, reliable online services offering ED prescriptions. Sildenafil Viagra.Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles . 18 / Vacuum devices for ED, also called pumps, offer an alternative to medication. You’ll place your penis inside a cylinder and use a pump to draw the air out. This creates a . You’ve likely heard of Viagra, Cialis, vardenafil (previously sold as Staxyn and Levitra), and Stendra. These are commonly prescribed treatments for erectile dysfunction (ED) — .