Susan Buchholz 
Henke’s Med-Math [PDF ebook] 
Dosage Calculation, Preparation, and Administration

This best-selling text features a highly visual, hands-on approach to learning dosage calculations and principles of drug administration. It presents step-by-step approaches to solving problems and includes dosage problems that simulate actual clinical experience. Each chapter includes numerous examples, self-tests, and proficiency tests. New Calculations in Action animations provide step-by-step demonstrations of how to solve equations presented in the text.