Understanding practical pharmaceutical calculations is essential for healthcare professionals. Even simple errors in calculation can have serious - and possibly fatal - consequences. Fully revised and updated, with entirely new chapters and a focus on basic arithmetic, this best-selling practical guide begins by explaining simple units of measurements and expressions of concentration, followed by demonstrations of how straight-forward calculations can be used to estimate individual patient dosages. At the end of each chapter there are self assessment calculations, with fully worked answers - ideal for revision and self-assessment. With the book and free downloads you can always have the guide on hand when you need it most.