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

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

(a) Oral osmotic pump

(b) Reservoir device

(c) Hydrodynamic pressure controlled system

(d) Altered density systems

I have been asked this question in an interview for internship.

This is a very interesting question from Biopharmaceuticals topic in chapter Biopharmaceuticals of Drug Biotechnology

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Right answer is (c) Hydrodynamic pressure controlled system

The explanation is: Hydrodynamic controlled systems are generated by swelling of a hydrophilic gum which will be further used to activate the delivery of drugs. The device comprises of a rigid, shape retaining hosing enclosing a collapsible compartment containing the drug. Such systems are also known as push-pull osmotic pumps.

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