What are the characteristics of the mixed monolithic-reservoir devices?

What are the characteristics of the mixed monolithic-reservoir devices? Correct Answer The drug-polymer matrix is layered by rate-controlling membrane

This device has drug release kinetics intermediate between monolithic and reservoir systems. Here the drug-polymer matrix is layered by a rate controlling membrane. The release is controlled initially by the membrane but as the drug gets depleted the rate is controlled by diffusion of the drug.
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