A 62-year-old woman who takes sertraline for depression is brought to the emergency department after a witnessed generalised tonic-clonic seizure at home. She is drowsy but rousable, with no focal neurological deficit; she appears euvolaemic with a blood pressure of 128/76 mmHg. Blood tests show sodium 114 mmol/L (135-145), potassium 4.0 mmol/L (3.5-5.2) and glucose 6.1 mmol/L. Which one of the following is the most appropriate immediate management?
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