Tolazamide 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
Tolazamide
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.
Tolazamide (a sulfonylurea diabetes pill) and acarbose both lower your blood sugar, but in different ways. Tolazamide tells your body to release more insulin, while acarbose slows how fast you absorb sugar from meals. Used together, they can push your blood sugar down more than either one alone, so you may have a higher chance of a low blood sugar (hypoglycemia) event, with symptoms like shakiness, sweating, or feeling dizzy.
The good news is your care team can manage this well by checking your sugars and adjusting doses as needed. One important tip: if you feel low, use glucose tablets or gel, not table sugar or candy, because acarbose blocks table sugar from working quickly.
Effect: Additive glucose-lowering, increasing hypoglycemia risk when acarbose is combined with the sulfonylurea tolazamide.
- Mechanism: Additive pharmacodynamic effect. Tolazamide is an insulin secretagogue; acarbose is an alpha-glucosidase inhibitor that delays carbohydrate absorption. Neither is a prodrug here.
- Onset: Rapid. Evidence: Theoretical, but mechanistically expected and clinically plausible.
- Management: Monitor blood glucose closely when acarbose is started or stopped; titrate either agent to minimize hypoglycemia. Because acarbose inhibits sucrose hydrolysis, treat hypoglycemia with oral glucose (dextrose), not sucrose/table sugar.
What happens
An increased risk of hypoglycemia
Interaction Deep Dive
When acarbose is given together with a sulfonylurea, blood glucose concentrations fall, which heightens the hypoglycemic potential of the sulfonylurea1. Acarbose on its own neither raises insulin availability nor enhances its activity. Rather, its antihyperglycemic effect stems from slowing or blocking the absorption of carbohydrates from the intestine, which produces a more modest postprandial increase in blood glucose. Individuals taking acarbose alongside a sulfonylurea should be advised of their elevated risk of hypoglycemia and be ready to address it should it occur.
Why it happens (mechanism)
Additive hypoglycemic effects
How to manage this interaction
Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise. Your care team can manage this combination safely.
- Monitor closely: Expect more frequent blood glucose checks, especially when acarbose is being added or stopped.
- Dosing: The dose of either or both drugs may need to be adjusted and individualized by your care team to reduce the chance of lows.
- Treating a low: Carry glucose tablets or glucose liquid, not candy or table sugar. Acarbose blocks table sugar (sucrose) from raising your blood sugar quickly.
- Tell your pharmacist or doctor if you notice frequent lows, shakiness, sweating, or confusion.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Tolazamide and Acarbose together?
Combining tolazamide and acarbose can add up to lower blood sugar and raise your risk of hypoglycemia, so monitor closely and treat any lows with glucose tablets or gel rather than table sugar. Your care team can adjust doses to keep this safe. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Tolazamide 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 Tolazamide and Acarbose interaction managed?
Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise. Your care team can manage this combination safely. Monitor closely: Expect more frequent blood glucose checks, especially when acarbose is being added or stopped. Dosing: The dose of either or both drugs may need to be adjusted and individualized by your care team to reduce the chance of lows. Treating a… 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 Tolazamide 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 (1)
- Product Information: Precose(R), acarbose. Bayer Corporation, West Haven, CT, 1998. DailyMed
Keep reading about Tolazamide
Keep reading about Acarbose
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