The Gastrointestinal Therapeutic System (GITS), developed by Pfizer, is a unique drug delivery system used in the manufacturing of certain extended-release tablets like Glucotrol XL ER and Procardia XL ER. Here's a step-by-step explanation of how it works:

1. The GITS system is designed to deliver a drug at a controlled rate over a prolonged period of time, which can be up to 24 hours. This is particularly useful for medications that need to maintain a constant level in the body.

2. The system consists of a tablet core containing the active drug, surrounded by a semi-permeable membrane. The membrane has a single, small, laser-drilled hole through which the drug is released.

3. When the tablet is ingested and reaches the stomach, it absorbs water through the semi-permeable membrane, creating a saturated solution of the drug inside the tablet core.

4. The hydrostatic pressure created by this influx of water pushes the drug out through the laser-drilled hole in the membrane, at a rate controlled by the size of the hole and the properties of the membrane.

5. The tablet then moves through the gastrointestinal tract, continuously releasing the drug as it absorbs more water. The rate of drug release remains constant, providing a steady dose of medication.

6. Eventually, all the drug is released, and the empty tablet shell is excreted from the body.

This system ensures a steady and controlled release of medication, reducing the need for frequent dosing and helping to maintain consistent drug levels in the body.

Question

The Gastrointestinal Therapeutic System (GITS), developed by Pfizer, is a unique drug delivery system used in the manufacturing of certain extended-release tablets like Glucotrol XL ER and Procardia XL ER. Here's a step-by-step explanation of how it works:

1. The GITS system is designed to deliver a drug at a controlled rate over a prolonged period of time, which can be up to 24 hours. This is particularly useful for medications that need to maintain a constant level in the body.

2. The system consists of a tablet core containing the active drug, surrounded by a semi-permeable membrane. The membrane has a single, small, laser-drilled hole through which the drug is released.

3. When the tablet is ingested and reaches the stomach, it absorbs water through the semi-permeable membrane, creating a saturated solution of the drug inside the tablet core.

4. The hydrostatic pressure created by this influx of water pushes the drug out through the laser-drilled hole in the membrane, at a rate controlled by the size of the hole and the properties of the membrane.

5. The tablet then moves through the gastrointestinal tract, continuously releasing the drug as it absorbs more water. The rate of drug release remains constant, providing a steady dose of medication.

6. Eventually, all the drug is released, and the empty tablet shell is excreted from the body.

This system ensures a steady and controlled release of medication, reducing the need for frequent dosing and helping to maintain consistent drug levels in the body.

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