Definition of Rehydration

Rehydration: The process of restoring lost water (dehydration) to the body tissues and fluids. Prompt rehydration is imperative whenever dehydration occurs, from diarrhea, exposure, lack of drinking water, or medication use. Rehydration can be by the oral route or by the intravenous administration of fluids.


Last Editorial Review: 9/20/2012

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