Drug Absorption Mechanisms — primary?
Passive diffusion is the main mechanism.
Passive Diffusion — mechanism?
Drugs cross membranes down concentration gradient, no energy.
Factors affecting absorption — key?
pH, surface area, blood flow, formulation.
Facilitated Diffusion — difference?
Carrier-mediated, no energy, specific to drugs.
Volume of Distribution — meaning?
Theoretical volume relating drug amount to plasma concentration.
Active Transport — process?
Energy-dependent, moves against gradient via carriers.
Bioavailability (F) — definition?
Proportion of dose reaching circulation unchanged.
Ionization & pH — impact?
Affects drug lipophilicity and absorption.
Factors influencing absorption
Surface area, blood flow, formulation, pH.
Drug absorption mechanisms — importance?
Determine onset, efficiency, and route effectiveness.
Test your knowledge with 10 questions on Fundamentals of Drug Absorption and Metabolism.
1. Which of the following best defines 'drug absorption mechanisms' in pharmacology?
2. What is the primary process responsible for the movement of most drugs across cell membranes during absorption?
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