How quickly does oral rehydration therapy relieve dizziness?

Dizziness can occur with diarrhoea, vomiting, sweating, poor intake, or another source of fluid loss. A suitable oral rehydration solution replaces water and salts together, and symptoms may settle as the body absorbs it. However, dizziness can also reflect low blood sugar, medication effects, an inner-ear problem, infection, bleeding, or a heart or neurological condition. Improvement after drinking does not identify the cause by itself.

Sit or lie down until the sensation passes, rise slowly, and take small sips of a correctly prepared solution if fluid loss is likely. Avoid driving, climbing, or operating machinery while dizzy. Keep track of vomiting, diarrhoea, urine output, medicines, and whether symptoms occur on standing. Do not force fluids if you have been told to restrict them.

Get urgent help for fainting, new weakness or numbness, trouble speaking, severe headache, chest pain, palpitations, breathlessness, confusion, blood loss, or inability to keep fluids down. Seek prompt assessment if dizziness is severe, persistent, repeatedly triggered by standing, or accompanied by very little urine or marked weakness.

Ask whether fluid loss is a likely explanation, which solution and amount are appropriate, whether any medicine may contribute, and what examination is needed if the dizziness continues.