ED can sometimes signal an underlying medical problem, like heart disease or diabetes , that needs to be treated separately. Get an online prescription and buy from a reputable online service. No side effects were reported in sexual partners. Oral medicines for ED usually work well and cause few side effects. But, you should still see your doctor to discuss other health issues.Overdose Ask your doctor Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription . Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that . 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 .