Enzymes can both activate drugs, by breaking them down into their  therapeutic ingredients from more complex molecules,  and deactivate them, by breaking harmful compounds down  into harmless metabolites.
Enzimi mogu i aktivirati lijekove, razgrađujući ih na njihove terapeutske sastojke složenijih molekula, ili ih deaktivirati razgrađujući štetne  spojeve u bezopasne metabolite.