Vasoconstriction is constriction or narrowing of a blood vessel. When a blood vessel constricts, the flow of blood is restricted or slowed. Medications may be used to treat vasoconstriction or to cause vasoconstriction.
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.