Tissue engineered grafts, vascular grafts, stents, patches or valves comprising an effective amount of an inhibitor of platelet aggregation selected from the group consisting of inhibitors of ADP mediated platelet signaling through the P2Y1, P2X1 or P2Y12 receptor on the surface of platelets, angiotensin II receptor blocker (ARB) inhibitors, and angiotensin-converting enzyme (ACE) inhibitors to reduce thrombosis or stenosis of the tissue engineered grafts, vascular grafts, stents, patches or valves following implantation, angioplasty or anastomosis in the vasculature of an individual in need thereof, wherein the dosage unit is sufficient to provide an effective amount covering the day prior to the implantation, angioplasty or anastomosis, and for a period thereafter until the endothelial surface of the vasculature disrupted by the implantation, angioplasty or anastomosis is restored.