As many as 25% of erectile dysfunction cases may be a direct result of medication.  Medications responsible for problems include antidepressants, antihypertensive medications, and drugs of abuse including alcohol and illegal drugs.
Also, as detailed above,  erectile dysfunction can be caused by underlying chronic health problems for which there is help.  If E.D. gets you into the physician's office and a controllable chronic problem is found,  E.D. may save your life!
One of the new E.D. drugs may work you  but it would be wrong to  ignore the fact that many cases of E.D. stem from chronic health problems.  While erectile dysfunction needs to be treated, certainly  a man should have a physician sort out  his medical status.