Mary Ann Howland, PharmD, DABAT, FAACT Clinical Professor of Pharmacy, St. Johns University College of Pharmacy; Consultant, Department of Emergency Medicine, Bellevue Hospital Center and New York University Medical Center; Senior Consultant in Residence, New York City Poison Center, New York, New York. McGraw-Hill authors represent the leading experts in their fields and are dedicated to improving the lives, careers, and interests of readers worldwide McGraw-Hill authors represent the leading experts in their fields and are dedicated to improving the lives, careers, and interests of readers worldwide Lewis R. Goldfrank, MD, FACEP, FAAEM, FAACT, FACMT, FACP Professor and Chair, Department of Emergency Medicine, New York University School of Medicine; Director, Emergency Medicine, Bellevue Hospital Center and New York University Medical Center; Medical Director, New York City Poison Center, New York, New York. McGraw-Hill authors represent the leading experts in their fields and are dedicated to improving the lives, careers, and interests of readers worldwide