Oral glucose should not be given when it poses a risk of harm, leads to undesired effects, or is not prescribed to the patient.
Oral glucose should not be administered when it poses a significant risk of harm to the patient, such as in cases of hypoglycemia where oral glucose could worsen the condition. In situations where the medication is likely to produce undesired effects or is not prescribed to the patient, administering oral glucose would not be appropriate.
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