How long does the medicine last in a cordis cypher stent?

The drug-eluting Cordis Cypher stent releases its medication over a period of approximately 30 to 90 days after implantation. The stent is designed to gradually deliver the drug, sirolimus, to the surrounding tissue to help prevent restenosis (re-narrowing of the artery). While the drug is most effective in the initial months, the stent itself remains in the body permanently.