This revised & expanded third edition written by experienced pharmacy lecturers has been updated to include a new chapter on calculations involving information retrieval the latest changes to the BNF & body surface area charts from the BNF for Children. Further topics include: rational numbers; systems of units; concentrations dilutions & formulations; calculation of doses; density displacement volumes & displacement values; calculations involving molecular weights; parenteral solutions & isotonicity; & accuracy of measurement. Each chapter contains learning objectives worked examples & sample questions & answers. Together with its companion text Pharmaceutical Calculations Workbook also published by Pharmaceutical Press Introduction to Pharmaceutical Calculations is essential reading for pharmacy undergraduates & pre-registration pharmacists.