This text provides a simple strategy for solving the mathematics of drugs and solutions encountered in the routine of administering medications. It uses the ratio and proportion method of calculation, presented in a workbook format. This format features a clear, step-by-step presentation enhanced by guided examples, extensive exercise sets and simulated clinical applications through actual drug labels, shaded syringes and medicine cups. In this fifth edition, the content has been completely reorganized, with examples and answers now placed within the chapter instead of the back of the book. Space is provided to work problems in the text itself, and perforated pages allow students to hand in their work.