What type of isotope is used for drug metabolism studies?

What type of isotope is used for drug metabolism studies?
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It will depend on the chemical structure of the drug and therate of metabolism. The most common isotopes that are used to "tag"drug molecules are tritium (3-H), carbon-14 (14-C), andphosphorous-32 (32-P). Other isotopes are also used, but these areprobably the most common.
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