plavix kontraindikacije plavix diarrhea plavix how long after stent plavix protonix interaction how does plavix work plavix therapeutic class plavix serious side effect plavix gi bleeding aciphex and plavix lawyer who will sue plavix patent expiration date for plavix cheaper plavix plavix powerpoint adverse reactions plavix plavix vs coumadin plavix and anemia plavix forum