Biopharmaceutics and Pharmacokinetics occupies a pivotal position in the B.Pharm curriculum, sitting at the junction between the physicochemical properties of a drug and its clinical behaviour in the human body. Where earlier courses in the curriculum teach students to synthesise, formulate, and analyse a drug substance, this course teaches them to reason quantitatively about what happens to that drug once it enters a patient — how quickly it appears in the bloodstream, how it distributes into tissues, how the body transforms and eliminates it, and how all of this can be captured in mathematical models that allow a rational dosage regimen to be designed. This textbook has been written to cover the complete syllabus of BP602T — Biopharmaceutics and Pharmacokinetics (Theory), a three-credit core course carrying 45 lecture hours, prescribed for the sixth semester of the B.Pharm programme. The subject is unusual among pharmacy courses in the sheer density of mathematics it requires: rate equations, exponential and logarithmic relationships, definite integrals, curve-fitting, and statistical moment theory all make an appearance. Many students who are otherwise comfortable with pharmaceutical science find this quantitative demand intimidating at first encounter.