The thoroughly updated Third Edition of this practical, entertaining reference is a complete and clear guide to calculating drug dosages. After reviewing basic math, the book shows nurses how to interpret hundreds of sample drug orders and perform hundreds of complex dosage calculations. Abundant illustrations and checklists help readers remember key points. This edition includes NCLEX(R)-style questions throughout the text, a new chapter on preventing medication errors, and an expanded chapter applying dimensional analysis to practical dosage calculation problems. The expanded Practice Makes Perfect section includes alternate-format NCLEX(R)-style questions. Readers can access up-to-the-minute drug information at eDruginfo.com.