From a molecule looking for something to bind to the medicines of the brain, heart, lungs, gut, blood, immunity and hormones, the drugs against microbes and cancer, the ways drugs harm, and how medicines are discovered, tested and regulated. Every model drug runs in the page — bound, absorbed, carried, metabolised and cleared in a model body — and every number is computed there. Thirty volumes, every plate in English and Chinese. Mechanism only: no plate is medical advice, and every dose is in a model drug’s own units.