Adding gabapentin to olanzapine.
- Olanzapine is principally metabolized by CYP1A2 and CYP2D6.
- 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 gabapentine 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. 
- KNMP; Informatorium Medicamentorum 2023; Monografie "olanzapine" (Dutch)
- Farmacotherapeutisch Kompas; Toxicologie (dutch)
- Woods SW Chlorpromazine equivalent doses for the newer atypical antipsychotics; J Clin Psychiatry 2003;64:663-667
- Farmacotherapeutisch Kompas - gabapentine (dutch)
- Interactions between olanzapine and gabapentin on drugs.com
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