Intravenous means "within a vein." It usually refers to giving medications or fluids (solutions) through a needle or tube inserted into a vein, which allows immediate access to the blood supply. For example, intravenous (IV) fluids.
Review Date: 5/2/2009 Reviewed By: Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.