Drug-eluting stents (DES) are medical devices used to treat narrowed or blocked coronary arteries in patients with coronary artery disease. These stents are coated with a special medication that is slowly released into the surrounding tissue to prevent restenosis, or the re-narrowing of the artery. By delivering medication directly to the site of the blockage, DES can help reduce the risk of complications such as blood clots and improve the long-term effectiveness of the stent. DES have been shown to be effective in reducing the need for repeat procedures and improving outcomes for patients with coronary artery disease.