Under the lack of energy a person may be drip on glucose.
it helps by providing the required energy and making them concious. 
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Glucose is given to a person when he/she is dehydrated.
He/she will require glucose until when he/she is able to eat anything through his/her own mouth and able to stand without any support.
The glucose normalize the dehydrated cell. It provides instant energy to
the cell.

Hope it helps :))

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