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How can we study the gastric emptying of a given drug?

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How can we study the gastric emptying of a given drug?

(a) By mixing the colour with the drug

(b) Waiting for the subject man to throw-up

(c) Tagging the drug with a radioisotope and scanning the stomach

(d) Waiting for the patient to pass feces

I have been asked this question in final exam.

I want to ask this question from Drugs Absorption from Non Oral Extravascular Sites topic in chapter Absorption of Drugs of Drug Biotechnology

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The correct option is (c) Tagging the drug with a radioisotope and scanning the stomach

For explanation I would say: In vivo gastric emptying of a drug can be studied by using radio-opaque contrast materials like barium sulphate. It can also be studied by tagging the drug with a radioisotope and scanning the stomach at regular intervals.

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