category X drug
Examples Accutane, thalidomide, vitamin A congeners, Xanax
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
category X drugPharmacology A therapeutic with known teratogenicity which is contraindicated for use during pregnancy–eg, vitamin A congeners–for severe acne–which cause a characteristic syndrome in neonates. See Vitamin A embryopathy.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.