when a patient falls unconscious or a he / she  is unable to do the daily activities . So at that moment , glucose is given to the patient in order to get more energy and to be fit and active.
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Under fainting conditions a patient requires a drip of glucose.It should be given to the patient untill he/she feels that he/she has got energy and can stand on his own.And untill, he/she is allowed to have his/her own food.

hoped helped u :))
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