In a recent study conducted on pharmacokinetic analysis of Simvastatin a two-compartment model was chosen as the final disposition model for simvastatin pharmacokinetics based on the OFV changes and GOF plots after testing one through three compartment models. The group tested various absorption models to describe the atypical, simvastatin concentration profile during absorption phase.
Recently the compartmental pharmacokinetic analysis has achieved the great height, now many computational systems are available that includes whole body and calculates you the pharmacokinetics of any drug as it like a human body. Systems are available that have as many as 18 or more physiological compartments in it. One of this PK-Sim of Bayer technology Services Gmbh. You can go to the link