What do systematic reviews say?

Intervention not reported

The intervention may leads to higher time to treatment withdrawal ‐ all participants Range of (low certainty).

• Phenobarbitone versus phenytoin monotherapy for partial onset seizures and generalised onset tonic-clonic seizures 2013 · Cochrane Headline outcomes only
  HR 1.62 [1.23, 2.14]
  3 studies · 499 participants
  Low