One-compartment distribution model is characterized by

One-compartment distribution model is characterized by

• A. Contains a single volume and simple clearance
• B. Involves multiple tissue compartments with rapid exchange
• C. Elimination occurs before distribution
• D. No distribution phase is assumed

Answer: (A)

Treat the body as a single, well-mixed compartment where the drug distributes rapidly and uniformly. In this model, the amount of drug declines only due to elimination, which is described by a constant clearance. The result is a simple, monoexponential decline with one apparent volume of distribution (Vd) and clearance (CL), linked by k = CL/Vd. This single-volume, linear-elimination description is the hallmark of the one-compartment model. The other statements describe multi-compartment behavior, or imply nonexistent or pre-distribution processes, which don’t fit this model as neatly.

Treat the body as a single, well-mixed compartment where the drug distributes rapidly and uniformly. In this model, the amount of drug declines only due to elimination, which is described by a constant clearance. The result is a simple, monoexponential decline with one apparent volume of distribution (Vd) and clearance (CL), linked by k = CL/Vd. This single-volume, linear-elimination description is the hallmark of the one-compartment model. The other statements describe multi-compartment behavior, or imply nonexistent or pre-distribution processes, which don’t fit this model as neatly.