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Originally Posted by ThroneofDravaris
A catalyst is a substance that can change another substance without being changed itself. In the situation that you give, neither the medication nor the human body are catalysts. The human body is automatically disqualified as it's the entity undergoing change; it's not changing anything itself. The medication isn't a catalyst either, since it's absorbed (ie changed) in the reaction that changes the human body.
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Could you give an example - preferably non-scientific?