I too wondered why stents fail, so I did Google search on "why stents fail" and got a bunch of seemingly informative hits. Here is first one I started reading
http://www.appliedradiology.com/Issues/ ... roved.aspx
One quickly gets idea that stents are by no means foolproof, either in process of insertion or subsequent use. I have no substantive idea what current status of stint technology is, but, some determined searching should be enlightening. What little I have read yet this morning does not give any information about medication to hinder clogging of stents, but, it must be out there somewhere.
For whatever it might be worth, I have one friend that was prescribed simvastatin many years ago, following insertion of stent. He was still taking simvastatin a couple of years ago -- I know nothing more about his situation, e.g., difficulties or lack thereof with stint, general condition of his arteries currently or when stent was inserted, etc.
I have another friend that had a near fatal heart attack, caused by rupture of a "plaque boil" somewhere in his body, and the area in artery that was blocked by clot was fitted with stent -- he was prescribed low dose aspirin. This person had totally plaque-free arteries every where investigated by probe used to insert stint. They never could establish location of ruptured plaque boil (vulnerable plaque). He had no previous indication of any adverse cardio-vascular condition.
Like many/most/nearly all??? posters here, I personally would have to be presented VERY convincing data for continued use of any statin drug. For me, NO doctor's advice alone would suffice. However, I was and remain quite healthy, other than the extensive damage and adverse effects of Lipitor, which I strongly wish I had refused.
Best wishes for finding verifiable information!