The Thirteenth Edition of Pharmaceutical Calculations represents a thorough update of this textbook, which for over six decades has met the needs of students in this subject area. This edition's Introduction presents a stepwise approach in solving calculations problems. Each chapter of this edition includes learning objectives that direct the student's focus and provide a basis for self-assessment following completion. Coverage includes new material in areas such as e-prescriptions, medication orders in nursing homes, hospice care, patient self-administration of analgesia, intravenous infusion rate calculations for the critical care patient, and patient conversions to alternative treatment plans. A companion Website includes the fully searchable text and an interactive quiz bank with more pharmaceutical calculation review problems.