Computer-aided dosage form design. II. Methods for defining a zero-order sustained-release delivery system of maximum...

Area of Science:

• Pharmacokinetics
• Drug Delivery Systems

Background:

• Classical methods for zero-order release rate calculation in sustained release products have limitations.
• Traditional approaches fail to establish minimum acceptable duration and lack formulation flexibility.
• Infinite dose and duration pairs can maintain desired plasma concentrations within a dosing interval.

Purpose of the Study:

• To develop a flexible computer simulation method for designing zero-order drug delivery systems.
• To establish boundary conditions for dose and duration that ensure consistent plasma drug levels.
• To identify group-wide specifications for sustained release formulations.

Main Methods:

• Utilizing computer simulations to determine the boundary conditions for drug release.
• Analyzing pharmacokinetic data to define acceptable ranges for dose and duration.
• Comparing individual subject boundary conditions to establish group-wide parameters.
• Illustrating the method with theophylline pharmacokinetics.

Main Results:

• The new method establishes a broader range of acceptable duration and dose values.
• It provides flexibility in formulation goals for sustained release products.
• Identified group-wide boundary conditions for zero-order drug delivery system design.
• Demonstrated applicability using theophylline pharmacokinetics.

Conclusions:

• Computer simulations offer a flexible and robust approach to designing zero-order drug delivery systems.
• The method overcomes limitations of classical pharmacokinetic calculations for sustained release formulations.
• This approach allows for broader design specifications, accommodating inter-subject variability.