Insulin Degludec vs Insulin Glargine: Which Should You Actually Pick?

Insulin Degludec at a glance:

• Drug class: Insulin / insulin analog
• Route: subcutaneous injection (insulin pump or pen); IV in hospital settings
• Typical frequency: varies — basal once or twice daily; bolus before meals
• Half-life: varies — minutes for rapid-acting analogs, hours for basal analogs
• Cash price (US): varies widely; most US insulins are now capped at $35/month for Medicare beneficiaries

Head-to-head comparisons in this space are useful but easy to overweight. The truth is that most differences shake out to a couple of percentage points of efficacy and a different side-effect distribution. Here's how the two compare.

Mechanism

Insulin Degludec: Insulin and its analogs replace or supplement endogenous insulin secretion, lowering blood glucose by promoting cellular glucose uptake and inhibiting hepatic glucose production.

Insulin Glargine: Insulin and its analogs replace or supplement endogenous insulin secretion, lowering blood glucose by promoting cellular glucose uptake and inhibiting hepatic glucose production.

For people new to this comparison, the practical takeaway is that both work through similar pathways but have different pharmacokinetics.

Dosing & Administration

Effectiveness

Insulin Degludec: Lowering of blood glucose; A1c reduction proportional to baseline.

Insulin Glargine: Lowering of blood glucose; A1c reduction proportional to baseline.

In head-to-head comparisons (where they exist), the higher-dose newer agents tend to outperform older ones — sometimes meaningfully. Reference trials: ADA Standards of Care provide consensus guidance for Insulin Degludec; ADA Standards of Care provide consensus guidance for Insulin Glargine.

Side Effects

The two compounds have overlapping side-effect profiles. Common to both:

• hypoglycemia
• weight gain
• injection-site reactions

Important risks worth knowing for both:

• severe hypoglycemia
• diabetic ketoacidosis if dosing is interrupted in T1D

Cost

Insulin Degludec: varies widely; most US insulins are now capped at $35/month for Medicare beneficiaries. Insulin Glargine: varies widely; most US insulins are now capped at $35/month for Medicare beneficiaries.

Insurance coverage and manufacturer programs change the relative cost picture significantly. See our individual cost guides for Insulin Degludec cost and Insulin Glargine cost for the latest numbers.

Which Is Right for You?

The practical decision usually comes down to four factors:

1. What's covered by your insurance? Often the deciding factor
2. What does your prescriber have experience with? Familiarity reduces dosing errors
3. How comfortable are you with injections (or oral dosing if applicable)?
4. What's your tolerance for side effects?

If you and your clinician end up split between Insulin Degludec and Insulin Glargine, either is a defensible choice in most cases.

Switching Between Them

Switching from Insulin Degludec to Insulin Glargine (or the reverse) is usually straightforward but should be done with clinician guidance — particularly to align dose escalation and avoid GI side effects from re-titration.

Bottom Line

Head-to-head comparisons are useful but rarely decisive. The bigger swing factors are usually outside the comparison itself.

Frequently Asked Questions

Related Reading

• Insulin Degludec: The Complete 2026 Guide (Mechanism, Dosing, Cost)
• Insulin Degludec Side Effects in 2026: Real Reports, Real Solutions
• Real Insulin Degludec Results: What 6 and 12 Months Actually Look Like
• Insulin Degludec Cost in 2026: What You'll Actually Pay (Real Numbers)
• Is Lantus Right for You? An Evidence-Based Breakdown
• What Is Humalog? Everything You Should Know Before Starting

Sources

• Heise T et al. Insulin Pharmacokinetics and Pharmacodynamics. Diabetes Obes Metab 2017;19:3.
• American Diabetes Association. Standards of Care in Diabetes — 2024. Diabetes Care 2024;47(Suppl 1).

This page is informational only and is not a personalized recommendation. The right choice depends on your individual situation.