Efficacy and Tolerability of Levetiracetam Add-On Treatment in Refractory Pediatric Patients With Partial Onset Seizures

"* high total tablet weight (HTTW) formulation in tablet strengths of 166.5 mg, 250 mg, and 500 mg was used for patients weighing at least 40.1 kg~* low total tablet weight (LTTW) formulation in tablet strengths of 166 mg and 250 mg was used for patients weighing 40 kg or less"

Placebo tablets for oral administration that were identical in appearance to the respective formulations (LTTW and HTTW) were used as reference therapy