Adding ziprasidone to olanzapine.
- Olanzapine is principally metabolized by CYP1A2 and CYP2D6.
- Ziprasidone is metabolized by CYP1A2 (minor) and CYP3A4.
- The combination of these 2 antipsychotics seems to be irrational from a pharmacotherapeutical point of view.
- Agents with anticholinergic properties may have additive (side)effects when used in combination. 
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