Yes, this regimen is appropriate and commonly used in clinical practice.
Using two short-acting insulin injections (with meals) combined with one intermediate-acting insulin injection (typically at bedtime) is a valid and effective insulin regimen, particularly for patients with type 2 diabetes who need intensification beyond basal insulin alone 1.
How This Regimen Works
This approach represents a "basal-plus" strategy where:
- One intermediate-acting insulin (like NPH) provides basal coverage, typically given at bedtime to control overnight and fasting glucose
- Two short-acting insulin injections cover postprandial glucose excursions at the two largest meals of the day
The 2025 ADA guidelines explicitly support starting with a single prandial dose at the largest meal and advancing to multiple prandial doses as needed 1. This stepwise intensification allows you to add prandial insulin injections based on individual postprandial glucose patterns rather than immediately jumping to full basal-bolus therapy.
Clinical Evidence Supporting This Approach
The basal-plus strategy has demonstrated:
- Better glycemic control with lower HbA1c compared to twice-daily premixed insulin 2
- Lower hypoglycemia rates than full basal-bolus regimens 2
- Less weight gain compared to more intensive insulin regimens 2
- Greater flexibility for patients with irregular meal schedules 1
When to Use This Regimen
This regimen is appropriate when:
- Basal insulin alone fails to achieve A1C targets despite acceptable fasting glucose
- Significant postprandial hyperglycemia exists at specific meals
- The patient needs more coverage than basal-only but isn't ready for full basal-bolus therapy
- You want to avoid the rigidity of twice-daily premixed insulin formulations
Practical Implementation
Start prandial insulin at 4 units or 10% of the basal insulin dose at the largest meal 1. Add a second prandial injection at the next largest meal if needed. The intermediate-acting insulin (NPH) is typically given at bedtime to provide overnight basal coverage.
Important Caveats
- Monitor for overbasalization: If you see bedtime-to-morning glucose differentials ≥50 mg/dL or increasing hypoglycemia, you may be using too much basal insulin to compensate for inadequate prandial coverage 1
- Consider GLP-1 RA first: Before adding prandial insulin, guidelines recommend trying a GLP-1 receptor agonist if not already prescribed, as this reduces hypoglycemia and weight gain risks 1
- NPH has limitations: Intermediate-acting insulins like NPH have more pronounced peaks and higher nocturnal hypoglycemia risk compared to long-acting analogs (glargine, degludec) 1
Alternative Consideration
If administering multiple injections is burdensome, twice-daily premixed insulin (like 70/30 NPH/regular) offers a simpler alternative that spreads insulin across the day 1. However, this sacrifices the flexibility that separate basal and prandial injections provide.
Human insulins (NPH and regular) remain cost-effective alternatives to analogs when financial constraints exist 1.