Cognitive problems are common in patients with epilepsy, but there is currently no specific treatment available. Vinpocetine is a chemical obtained from the leaves of the Lesser Periwinkle. It has been shown to improve cerebral metabolism and memory in animals and humans. In addition, it has been shown to enhance long-term potentiation, which has been linked to memory mechanisms. Furthermore, vinpocetine has been shown to have anticonvulsant effects and is more potent than several commonly used antiepileptic drugs (i.e., carbamazepine, phenytoin, valproate, oxcarbazepine, lamotrigine and topiramate) in inhibiting both sodium and calcium channels, which control release of excitatory neurotransmitters that can lead to brain injury. Thus, vinpocetine might offer a unique drug to help cognition in patients with epilepsy. The investigators propose to conduct pilot studies in healthy volunteers and in patients with epilepsy to assess the potential efficacy and safety of different dosages of vinpocetine in improving cognition.