 Stent thrombosis is current main issue after introduction of drug-eluting stents and theoretically dual antiplatelet therapy should be continued to prevent the stent thrombosis until complete reendothelization. Currently, AHAACC guideline recommend dual antiplatelet should continue at least 3 months in Sirolimus eluting stent SES and 6 months in paclitaxel eluting stent PES, but if possible, suggest to use until 12 months. 