Adding gabapentin to ziprasidone.
- Ziprasidone is metabolized by CYP1A2 (minor) and CYP3A4.
- Gabapentin is eliminated unchanged by the kidney for 100%.
- This combination of drugs may have possible synergistic effects. There are no reports for pharmacokinetic drug interactions. However, the combination will have additional side effects. 
- Start gabapentin according to the general dosing advice.
- Central nervous system- and/or respiratory-depressant effects may be additively or synergistically increased in patients taking multiple drugs that cause these effects. 
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