Lenalidomide is rapidly absorbed after oral administration under fasting conditions in healthy volunteers, with peak plasma concentrations (Cmax) occurring within 0.5 to 2 hours after administration. In patients and healthy volunteers, Cmax and area under the concentration-time curve (AUC) increase proportionally with increasing dose. Multiple administration does not result in appreciable accumulation of lenalidomide. In plasma, the relative exposure of the S- and R-enantiomers of lenalidomide is approximately 56% and 44%, respectively.