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Which of the following oral controlled release system is shown in the picture? (a)Matrix system

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Which of the following oral controlled release system is shown in the picture?

(a) Matrix system

(b) Encapsulated system

(c) Rigid matrix

(d) Swellable matrix

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My question is based upon Biopharmaceuticals in portion Biopharmaceuticals of Drug Biotechnology

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Correct choice is (c) Rigid matrix

The best explanation: Rigid matrix are made up of plastics such as PVC or fatty acids such as stearic acid or bees wax. The drug is generally kneaded with the solution in an organic solvent and then granulated. Waxy matrix are prepared and then compressed into tablets.

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