Acarbose and Hydroflumethiazide: 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
Hydroflumethiazide
No brand names on recordAcarbose
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.
Here's what's going on. Hydroflumethiazide is a water pill (a thiazide diuretic). Medicines in this family can nudge your blood sugar upward and make it a little harder to keep your glucose under control. Acarbose is a diabetes medicine that helps lower blood sugar after meals. So the water pill may push against what your acarbose is trying to do.
The good news is this is based on theory more than on strong real-world proof, and it's very manageable. Your care team can simply check your blood sugar a bit more often and fine-tune your doses if needed. Please don't stop or change either medicine on your own, just bring it up with your pharmacist or doctor.
Mechanism: Thiazide and thiazide-like diuretics (including hydroflumethiazide) can impair glucose tolerance and raise blood glucose, potentially antagonizing the glycemic effect of acarbose. This is a pharmacodynamic interaction, not CYP-mediated; neither agent is a prodrug.
- Direction: reduced glycemic control / possible hyperglycemia; antidiabetic requirements may rise (or shift either way).
- Evidence: theoretical.
- Onset: unspecified.
- Management: monitor glucose more frequently when starting, and also on diuretic withdrawal. Individualize and adjust acarbose or insulin/other antidiabetics per the care team.
What happens
An increased risk of hyperglycemia and an increased insulin requirement
Interaction Deep Dive
Some diuretics can affect glucose tolerance or blood glucose values, which may make a patient more susceptible to hyperglycemia or a loss of glycemic control. The need for insulin might rise123, fall, or remain the same 4. When a particular diuretic must be taken together with an antidiabetic drug, monitor glucose levels more often, including at the time the diuretic is discontinued 56. Adjusting the dose of insulin or oral antidiabetic agents may become necessary 78.
Why it happens (mechanism)
Altered glucose metabolism
How to manage this interaction
This is manageable with monitoring and dose tailoring. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Your team may check your blood sugar more often, especially when the water pill is started or stopped.
- Watch for signs of high blood sugar (extra thirst, frequent urination, tiredness) and report them.
- Your acarbose or insulin dose may need to be adjusted and individualized by your care team.
- Ask your pharmacist or doctor before making any changes, and mention any time the diuretic is added or removed.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Acarbose and Hydroflumethiazide together?
The water pill (hydroflumethiazide) can raise blood sugar and work against acarbose, so your team may check glucose more often and adjust your diabetes dose. Keep taking both as prescribed and flag any changes to your pharmacist or doctor. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Acarbose and Hydroflumethiazide interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Acarbose and Hydroflumethiazide interaction managed?
This is manageable with monitoring and dose tailoring. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Your team may check your blood sugar more often, especially when the water pill is started or stopped. Watch for signs of high blood sugar (extra thirst, frequent urination, tiredness) and report them. Your acarbose or insulin dose may need to be adjus… 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 Acarbose or Hydroflumethiazide 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 (8)
- Product Information: TOUJEO(R) subcutaneous injection, insulin glargine subcutaneous injection. sanofi-aventis (per manufacturer), Bridgewater, NJ, 2015. DailyMed
- Product Information: Tresiba subcutaneous injection solution, insulin degludec subcutaneous injection solution. Novo Nordisk A/S (per EMA), Bagsvaerd, Denmark, 2013. DailyMed
- Product Information: SEMGLEE(R) subcutaneous injection, insulin glargine-yfgn subcutaneous injection. Mylan Pharmaceuticals Inc (per FDA), Morgantown, WV, 2023. DailyMed
- Product Information: chlorthalidone oral tablets, chlorthalidone oral tablets. Pliva,Inc, East Hanover, NJ, 2004. DailyMed
- Product Information: XIGDUO(TM) XR oral extended release tablets, dapagliflozin metformin HCl oral extended release tablets. AstraZeneca Pharmaceuticals LP (per manufacturer), Wilmington, DE, 2014. DailyMed
- Product Information: GLUMETZA(R) oral extended-release tablets, metformin HCl oral extended-release tablets. Santarus, Inc. (per Manufacturer), San Diego, CA, 2013. DailyMed
- Product Information: ACCURETIC(TM) oral tablets, quinapril HCl hydrochlorothiazide oral tablets. Parke-Davis (per FDA), New York, NY, 2015.
- Product Information: DYRENIUM(R) oral capsules, triamterene oral capsules. Wellspring Pharmaceutical Corporation, Ontario, Canada, 2005. DailyMed
Keep reading about Hydroflumethiazide
Keep reading about Acarbose
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