Biopharmaceutics & Pharmacokinetics Important Questions | B Pharm 6th Semester

The video is a exam preparation guide for B.Pharm 6th semester students studying Biopharmaceutics & Pharmacokinetics. The instructor begins by emphasizing that Units 1 and 2 are the most important for exam purposes, generating the highest number of questions, while Units 3, 4, and 5 are still relevant but contribute fewer questions.

For Unit 1, the instructor identifies two major question areas: (1) mechanisms of drug absorption (active and passive transport, with diagrams), and (2) factors affecting drug absorption. These two topics may be asked together as a long question or separately as short 5-7 mark questions. Another key Unit 1 topic is the kinetics of protein binding and the significance of protein-drug binding.

Unit 2 focuses on drug metabolism (also called biotransformation), including Phase 1 and Phase 2 reactions. The instructor clarifies that metabolism and biotransformation are the same concept and students should not get confused. Other Unit 2 topics include non-renal routes of drug excretion, bioavailability (its objectives and measurement using blood/plasma concentration data), pharmacokinetic methods for measuring bioavailability, methods to enhance dissolution rate and bioavailability of poorly soluble drugs, in vitro-in vivo correlation (IVIVC) studies, and bioequivalence.

Unit 3's most frequently repeated question involves calculating elimination rate constant and half-life using the one-compartment open model for IV bolus administration, along with calculating various pharmacokinetic parameters. Occasionally, questions on compartment vs. physiological pharmacokinetic models also appear.

Unit 4 centers on the two-compartment open model (also applicable to multi-compartment models), how steady-state drug levels are calculated, and definitions of loading and maintenance doses.

Unit 5 covers two key topics: non-linear kinetics (its causes and detailed explanation) and the Michaelis-Menten equation for estimating pharmacokinetic parameters — a topic students would have previously encountered in biochemistry during 2nd semester.

The instructor concludes by encouraging students to cover all these topics to score well in their exams.