Adding topiramate to gabapentin.
- Gabapentin is eliminated unchanged by the kidney for 100%.
- Topiramate induces CYP3A4 and is an inhibitor of CYP2C19.
- 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 topiramate according to the general dosing advice.
Farmacotherapeutisch Kompas - gabapentine (dutch)
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- Freeman et al. Mood stabilizer Combinations: A Review of Safety and Efficacy. Am J Psychiatry 1998;155:12-21
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