Hyponatremia associated with repeated use of levetiracetam.

Levetiracetam (LEV) is increasingly used as adjunctive anticonvulsant therapy because of apparent low toxicity. Somnolence, asthenia, headache, dizziness, and nervousness are the most frequently reported side effects (1). We describe a patient, predisposed to the development of the syndrome of inappropriate antidiuretic hormone secretion (SIADH), in whom hyponatremia developed after two challenges of LEV.