What are the characteristics of diffusion-controlled release systems?

What are the characteristics of diffusion-controlled release systems? Correct Answer Diffusion of the dissolved drug

The rate controlling step is the diffusion of the dissolved drug through a polymeric barrier. The drug release rate is never 0. The diffusional path length increases with time as the insoluble matrix gradually depletes from the drug. Two types of diffusion-controlled systems are matrix systems and reservoir systems.
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