This medication is used to treat anemia in patients with a certain blood/bone marrow disorders (myelodysplastic syndrome-MDS, multiple myeloma). These patients do not have enough properly working red blood cells. They often require blood transfusions to reverse their anemia. Lenalidomide may decrease the need for treatment with blood transfusions.Lenalidomide is a type of drug known as an immunomodulator. It is believed to work by decreasing the immune system's response, thereby lowering the number of working red blood cells that are destroyed naturally by the bodyHow to use Lenalidomide OralThis medication must be used only within the RevAssist guidelines in order to avoid any possible exposure of an unborn baby to the drug. Consult your doctor or pharmacist.Read the Medication Guide and the Patient Information Leaflet provided by your pharmacist before you start using lenalidomide and each time you get a refill. If you have any questions, consult your doctor or pharmacist.Before starting therapy, women of childbearing age should have two negative pregnancy tests before taking the drug. (See Warning section.)Take this medication by mouth with a full glass of water, usually once daily or as directed by your doctor. Swallow this medication whole. Do not break, chew, or open the capsules. Dosage is based on your medical condition, response to therapy, and laboratory test results. Be sure to follow your doctor's directions carefully.Use this medication regularly in order to get the most benefit from it. Remember to take it at the same time each day.Inform your doctor if your condition persists or worsens.Lenalidomide Oral is used to treat the following:Multiple Myeloma, Bone Marrow Disorders Occurring Before Leukemia