After two heart attacks and 4 stents, I left the hospital with a prescription for Effient, supposedly a better drug to keep arteries from clogging around stents. But after first month free sample, refills cost me $90 co-pay. So my doctor gave me an Rx for Plavix, which I see has side effects of bad bruising. The insurer (Physicians United) refused my doctor's appeal that it's not a good idea to switch from one to another. All experience with these two drugs would be appreciated.