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There are two phases of drug metabolism:

Phase I - Functionalizes the drug molecule. In this phase, there are addition or modification of functional groups in order to make them more susceptible to phase II of metabolism.

Phase II - Conjugates the molecule. In this phase, the functional handles of the molecule can be conjugated to highly hydrophilic molecules in order to facilitate the excretion.

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Q: What are the phases of drug metabolism?
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