A 46-year-old woman presents with a generalised tonic-clonic seizure. Serum sodium is 112 mmol/L, serum osmolality is 240 mOsm/kg and glucose is 5.2 mmol/L. She has no focal neurological deficit, and the hyponatraemia is believed to have developed over less than 24 hours while taking a thiazide diuretic. Which treatment should be administered immediately?
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