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General Principles Of Pharmacology/Multiple dose kinetics

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Previous Page: First Order Model

Contents

Multiple Dose Kinetics

Rate of Absorption

The faster the rate of absorption, the greater the peak-to-trough levels. The rate of absorption has no effect on the time to steady-state or the plateau concentration at steady-state.

Hit the PLOT button to display the two curves below. The graph shows a multiple dosing scheme for two different rates of absorption, with the dosing interval equal to twice the half-time for elimination.

Rate of Elimination

Changing the rate of elimination affects the time to achieve steady state. The slower the drug is eliminated, the longer it takes to achieve steady state. In addition, the slower it is eliminated, the higher the steady-state concentration, with no change in peak to trough levels.

Hit the PLOT button to display two curves below. The graph shows a multiple dosing scheme for two different rates of elimination, with the dosing interval equal to twice the half-time for elimination for the faster component. Therefore, the lower curve reaches a plateau after four doses, and the upper curve requires more doses for a plateau.

Frequency of Administration

In general, the more frequently the drug is given, for the same total dose, the smaller the peak to trough ratio will be. Higher rates of administration (with the same total dose) will provide finer control over the plasma levels.

Next Page: Renal Extraction Ratio
Previous Page: First Order Model

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This page has been accessed 459 times. This page was last modified 12:17, 21 August 2008. All content, except where otherwise noted, is licensed under a Creative Commons Attribution License.

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