Study Evaluating the Pharmacokinetics of Keppra Extended Release (XR) in Children and Adults With Epilepsy

An Open-Label, Multicenter, Parallel-Group, Two-Arm Study Comparing the Pharmacokinetics of Keppra XR in Children (Aged 12 - 16 Years Old) With Epilepsy and in Adults (Aged 18 - 55 Years Old) With Epilepsy

To study how the body absorbs, distributes, metabolises and eliminates Keppra XR in both children (12 to 16 years old) and adults (18 to 55 years old) with epilepsy.

Inclusion Criteria:

• Subjects with a diagnosis of epilepsy on up to three concomitant anti-epileptic drugs
• Subjects on levetiracetam immediate release (IR) can be enrolled if on a stable dose for 7 days

Exclusion Criteria:

• Subjects with a history of status epilepticus within 3 months of Visit 1
• Subject has difficult venous accessibility