A new warning has been added to the label of lenalidomide (Revlimid), a drug used in treating multiple myeloma. Various clinical trials have indicated that there is an increased risk that the patient will develop new types of cancer after treatment with lenalidomide. Information about this risk has been added to the label and to the patient medication guide. The Food and Drug Administration (FDA) isn't recommending delaying, modifying, or restricting the use of lenalidomide, but health care professionals should assess patients receiving lenalidomide and discuss this risk with them. Adverse effects from lenalidomide should be reported to the FDA MedWatch Safety Information and Adverse Event Reporting Program at http://www.fda.gov/MedWatch/report.htm.