Glyburide and Acarbose: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 10, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Glyburide
Acarbose
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Both of these medicines lower your blood sugar, just in different ways. Glyburide tells your body to release more insulin. Acarbose slows how fast you absorb sugar from your meals. When you take them together, their effects add up, so your blood sugar can drop lower than it would with either one alone. This is called hypoglycemia, and it can cause shakiness, sweating, confusion, or feeling faint.
One important tip: if your sugar drops, you need glucose tablets or glucose gel, not regular table sugar or candy. Acarbose blocks table sugar from working quickly. Your care team can manage this safely, so keep taking both as prescribed and talk with them about a plan.
Effect: Additive hypoglycemia when acarbose is combined with glyburide (a sulfonylurea). Glyburide is an insulin secretagogue; acarbose is an alpha-glucosidase inhibitor that delays intestinal carbohydrate absorption. Neither is a prodrug; this is a pharmacodynamic (additive), not PK, interaction.
- Direction: Increased hypoglycemic potential of glyburide.
- Onset: Rapid. Evidence: Theoretical. Severity: Major.
- Management: Monitor blood glucose closely when acarbose is started or stopped; titrate either/both agents. Treat hypoglycemia with oral glucose (dextrose), not sucrose, since acarbose inhibits sucrose hydrolysis.
What happens
An increased risk of hypoglycemia
Interaction Deep Dive
When acarbose is given together with a sulfonylurea, blood glucose concentration is reduced, which heightens the hypoglycemic potential of the sulfonylurea2. Acarbose on its own neither raises insulin availability nor enhances insulin activity. It lowers blood glucose through an antihyperglycemic mechanism that slows or blocks carbohydrate absorption from the intestine, producing a more modest postprandial increase in blood glucose. Individuals taking acarbose alongside a sulfonylurea should be advised that their risk of hypoglycemia is elevated and should be ready to address such an event.
Why it happens (mechanism)
Additive hypoglycemic effects
How to manage this interaction
Keep taking both medications as prescribed unless your prescriber tells you otherwise. This combination is used intentionally, but it does raise the chance of low blood sugar.
- Expect closer blood glucose monitoring, especially when acarbose is added or stopped.
- The dose of either or both drugs may need to be adjusted and individualized by your care team.
- Carry glucose tablets or glucose liquid, not candy, juice, or table sugar. Acarbose keeps regular table sugar from correcting a low quickly.
- Learn the signs of a low (shakiness, sweating, confusion) and tell your pharmacist or doctor if you have frequent lows.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In patients with type 2 diabetes, acarbose did not alter the absorption or elimination of glyBURIDE. Nonetheless, although the average effects were not significant, individual patients displayed variability in absorption 1.
Common questions
Can I take Glyburide and Acarbose together?
Taking glyburide and acarbose together adds up to a higher risk of low blood sugar, so monitor closely and keep glucose tablets or gel (not table sugar) on hand to treat a low. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Glyburide and Acarbose interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.
How is the Glyburide and Acarbose interaction managed?
Keep taking both medications as prescribed unless your prescriber tells you otherwise. This combination is used intentionally, but it does raise the chance of low blood sugar. Expect closer blood glucose monitoring, especially when acarbose is added or stopped. The dose of either or both drugs may need to be adjusted and individualized by your care team. Carry glucose tablets or glucose liquid, no… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Glyburide or Acarbose need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (2)
Keep reading about Glyburide
Keep reading about Acarbose
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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