********** MODEL NAME model_abs1_1cpt_parent_1_cpt_met ********** MODEL NOTES PK model for simulation of drug concentration in central compartment for parent and metabolite with following characteristics: Compartments: 1 Elimination : linear Absorption : first order (with lag time) It is assumed that the rate of formation of the metabolite is equal to the rate of elimination of the parent Unit convention Dose: mg Concentration: ug/mL Time: hours The annotation of the parameter units is consistent with the given unit convention. Units of the inputs (dose) and outputs (concentration) in the dataset for parameter estimation need to match the unit convention. ********** MODEL STATES d/dt(Ad) = -kabs*Ad + Fabs1*INPUT1 d/dt(Parent) = kabs*Ad - CLP/VCP*Parent d/dt(Metabolite) = CLP/VCP*Parent - CLM/VCM*Metabolite Ad(0) = 0 Parent(0) = 0 Metabolite(0) = 0 ********** MODEL PARAMETERS Fabs1 = 1 # Relative bioavailability (-) kabs = 2 # Absorption rate parameter (1/hour) CLP = 3 # Apparent clearance parent (L/hour) VCP = 32 # Apparent central volume parent (L) CLM = 3 # Apparent clearance metabolite (L/hour) VCM = 32 # Apparent central volume metabolite (L) Tlag1 = 0 # Absorption lag time (hours) ********** MODEL VARIABLES % Calculation of concentration in central compartment for parent CPP = Parent/VCP % Calculation of concentration in central compartment for metabolite CPM = Metabolite/VCM % Defining an output (only needed when interfacing with NLME % parameter estimation tools such as NONMEM and MONOLIX) OUTPUT1 = CPP # Parent concentration (ug/mL) OUTPUT2 = CPM # Metabolite concentration (ug/mL) ********** MODEL REACTIONS ********** MODEL FUNCTIONS ********** MODEL EVENTS