Oral ED medications are generally well-tolerated, Dr. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. Avanafil Stendra. An inherited eye disease that affects the retina. ED can sometimes signal an underlying medical problem, like heart disease or diabetes , that needs to be treated separately. The medication was developed by U. Severe liver disease.Before buying ED drugs on the internet, see your doctor to find out exactly what’s causing the problem. It may turn out that you don’t need to take these drugs. Health conditions . Although erectile dysfunction (ED) may be an upsetting diagnosis for some, many people find their condition is treatable with Viagra — sometimes called the “little blue pill” — and . Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online.