How is the route of administration decided?

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Generally, if someone can eat and drink, then the use of subcutaneous insulin to regulate their blood glucose levels is appropriate.
The use of insulin intravenously by infusion is appropriate when:
- The patient has recurrent vomiting
- The patient is nil by mouth
- The patient is missing more than 1 meal (e.g. an operation or procedure)
- The patient is severely ill and good glucose control is needed
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