Epilepsy , seizures , and memory loss

Epilepsy is a neurological disorder in which the electric impulses (acting as messages) produced by the neurons are released in rather random pattern than simultaneous. This random release leads to inadequate summary impulse which would either be inefficient or would interfere with other normal impulses released from other healthy brain areas.
The most common symptom of epilepsy is seizures. There are different types of seizures related to different types of epilepsy. People experiencing epilepsy do not complain about decreased concentration. The memory is not affected either, except when the seizures occur, of course. However, both concentration and memory might be affected as side-effects of the antiepileptic drugs.
You might want to visit a neurologist for additional information about epilepsy and its symptoms and treatment.