What to Do When Blood Sugar Won’t Go Down

When blood glucose levels remain persistently elevated despite appropriate therapeutic interventions, clinicians refer to this as “refractory hyperglycemia.” This clinical scenario warrants systematic reassessment—not escalation of existing therapy alone. First, adherence to prescribed medications, dietary recommendations, and physical activity regimens must be objectively verified, as nonadherence is the most common cause of apparent treatment failure.

Next, clinicians should evaluate for underlying physiological contributors: undiagnosed or worsening insulin resistance, progressive beta-cell dysfunction, concomitant endocrinopathies (e.g., Cushing syndrome, acromegaly, or pheochromocytoma), or chronic inflammatory conditions such as rheumatoid arthritis or nonalcoholic steatohepatitis. Medication-related factors—including corticosteroid use, atypical antipsychotics, or certain diuretics—must also be scrutinized.

Diagnostic workup typically includes HbA1c, fasting and postprandial glucose, fasting insulin and C-peptide levels, and targeted hormonal assays if clinical suspicion arises. Continuous glucose monitoring (CGM) provides valuable insight into glycemic variability, nocturnal hyperglycemia, and unrecognized hypoglycemia—patterns that may guide more precise regimen adjustments.

Therapeutic recalibration may involve transitioning from oral agents to injectable therapies—such as GLP-1 receptor agonists or basal insulin—based on individual risk profiles, comorbidities, and hypoglycemia risk. In select cases, combination injectable regimens or ultra-rapid-acting insulins may be indicated. Importantly, diabetes management must remain person-centered: goals should reflect life expectancy, cognitive status, functional independence, and patient preferences—not arbitrary numeric targets alone.