Two compartment model iv bolus muju

TWO COMPARTMENT
MODEL-IV BOLUS
Presented by: Mujammil Maniyar
M. Pharm. Sem II
(PHARMACEUTICS)
Guided By: Miss. Aishwarya Mam
R.G. SAPKAL COP,
ANJENERI,NASHIK

 INTRODUCTION
 COMPARTMENT MODELS
 TWO COMPARTMENT MODEL(I.V BOLUS)
 METHOD OF RESIDUAL
 PARAMETERS OF TWO COMPARTMENT
 INTRAVENOUS INFUSION
 CLINICAL APPLICATIONS

PHARMACOKINETICS:
pharmacon:drug
kinesis-motion/change of rate
pharmacokinetics is the study of kinetics
of absorption,distribution,metabolism and
excretion(ADME) of drugs and their
corresponding pharmacologic,therapeutic
or toxic responses in man and animals.
Introduction :

Compartment models are classical
pharmacokinetic models that simulate the
kinetic processes of drug absorption,
distribution and elimination with little
physiologic detail.
Compartment model :

 A physiological system is described by
decomposition into number of interacting
substances called compartments.
 Mass of well mixed ,homogenous
material.
 Behaves uniformly.
 Exchange material.1/1/

Two compartment model :
 Many drugs given in single IV bolus dose
demonstrate a plasma level time curve that
does not decline as single exponential
process
 In two compartment model drugs the
plasma drug conc. Declines biexponentially
as the sum of two first order process, i.e
distribution and elimination
 Does not equilibrate throughout the body

 Drug distributes in 2 compartments
i.e central compartment &
tissue/peripheral compartment.

Central compartment :
 Represents the blood ,extracellular fluid
and highly perfused tissues
 Drug distributes rapidly and uniformly

General grouping of tissue
accoring to blood supply
Highly perfused - Heart,brain,hepatic
portal vein,kidney and
endocrine glands,skin and
muscles
 Slowly perfused - Adipose tissue and marrow
Bone,ligaments,tendons, hair, teeth

Two comopartment model :
They differ in whether the drug elimination
occurs from:
• the central compartment(Model 1)
• the peripheral compartment(Model 2)
• or both(Model 3)

Continuied…..
 MODEL 1:
Major sites of drug elimination occurs in
organs such as kidney and liver(highly
perfused with blood).
 MODEL 2:
Drug is assumed to follow the first order
kinetics1/1/

Parameter of two compartment
model:
 Apparent volume of distribution
 Drug clearance
 Biological half life
 Elimination rate constant
 AUC1/

Apparent volume of distribution :
 Relates plasma conc. to the amount of
drug in the body
 Drugs with large extravascular
distribution,apparent Vd is generally large
 Drugs with high peripheral tissue binding
also have large apparent Vd
 For polar drugs,apparent Vd is small
 Reflects the extent of drug distribution
1/1/

Drug clearance :
 Clearance is the volume of plasma that
is
cleared of drug per unit time.
Cl=Vd/b
 Useful in determining average drug
conc.

Elimination constant:
 Elimination rate constant of central
compartment and tissue compartment
Because of redistribution of drug out of
tissue compartment ,b is smaller than k.
Three rate constants are associated
with two compartment model
k21=Ab+Ba/B+A
k10=ab/k21
k12=a+b-k21-k10

Biological half life:
 Biological half life can be determined
from the rate constant.
t1/2=0.693/b1/

Area under curve:
TWO STEP METHOD:
1. Trapezoidal method
AUCt-∞=Co/ke
2. By using equation
AUCtotal=Co/k10
AUC=B/b+A/a

Conclusion :
 Pharmacokinetic models predict drug
disposition after drug administration.
 Statistical methods are used for the
estimation and data interpretation of
pharmacokinetic parameters.
 Useful in drug formulation and treatment
regimen.1/1/

Two compartment model iv bolus muju

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