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Prescribing

Basal insulin initiation

Practical starting doses and titration for basal insulin in type 2 diabetes.

Last reviewed 2026-01-05|endocrine | diabetes | insulin

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Dosing quick reference

Medication (generic)

Insulin glargine (U100)

Starting dose

10 units at bedtime or 0.1-0.2 units/kg

Typical titration / target

Increase by 2 units every 3 days to fasting target

Monitoring / notes

Review hypoglycemia risk and injection technique.

Medication (generic)

Insulin NPH

Starting dose

10 units at bedtime

Typical titration / target

Increase by 2 units every 3 days to fasting target

Monitoring / notes

Higher nocturnal hypoglycemia risk; consider SMBG overnight.

Contraindications

  • Do not initiate basal insulin during active hypoglycemia.
  • Defer routine outpatient starts when severe acute illness or ketosis concern is present.
  • Verify insulin product and concentration carefully to avoid dosing errors.

Renal and hepatic considerations

  • Start conservatively and titrate carefully when renal function is reduced.
  • Use additional caution in significant hepatic impairment due to altered glucose handling.
  • Reassess dosing pace when oral intake is inconsistent or frailty is present.

Pregnancy and lactation cautions

  • Pregnancy requires individualized glycemic targets and medication planning.
  • Review preconception goals and coordinate early obstetric/diabetes support when relevant.
  • During lactation, reinforce hypoglycemia prevention and individualized dose reassessment.

Monitoring checkpoints

  • Titrate slowly with fasting SMBG; pause titration if hypoglycemia occurs.
  • Ensure patients understand sick day management and hypoglycemia treatment.
  • Reassess A1C in 3 months and adjust prandial therapy if needed.

Stop or escalate criteria

  • Escalate urgently for recurrent or severe hypoglycemia.
  • Escalate if fasting targets remain persistently above goal despite appropriate titration and adherence support.
  • Escalate immediately when ketosis symptoms or significant clinical deterioration appear.