Acarbose and Carteolol: 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
Acarbose
Carteolol
No brand names on record
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.
Acarbose helps lower your blood sugar, and carteolol is a beta-blocker used for blood pressure or heart conditions. When taken together, two things can happen. First, your blood sugar may swing a bit more than usual, either lower or higher. Second, and more important, carteolol can hide some of the early warning signs of low blood sugar. Normally a fast heartbeat tips you off, but the beta-blocker can dull that signal. You may still feel sweaty or shaky, but the racing heart may not show up.
The good news is your care team can handle this easily by checking your sugar a little more often and fine-tuning your doses. Keep taking both as prescribed and let them know if you feel unwell.
Effect: Combining acarbose with the nonselective beta-blocker carteolol may alter glycemic control (hypo- or hyperglycemia) and, importantly, mask adrenergic warning signs of hypoglycemia.
- Mechanism: Beta blockade blunts sympathetic tachycardia and can impair counterregulatory glucose recovery; altered glucose metabolism may worsen hyperglycemia in HF/diabetes.
- Direction/magnitude: Variable; tachycardia is suppressed while diaphoresis/dizziness may persist. Neither drug is a prodrug.
- Onset: Delayed. Evidence: Probable.
- Management: Increase frequency of glucose monitoring; individualize antidiabetic dosing. On beta-blocker withdrawal, watch for loss of glycemic control.
What happens
Hypoglycemia or hyperglycemia; decreased symptoms of hypoglycemia
Interaction Deep Dive
Taking antidiabetic medications together with beta-blockers can produce either hypoglycemia or hyperglycemia, and may mask the warning signs of hypoglycemia12. Among those signs, tachycardia can be blunted, whereas other manifestations such as dizziness and sweating are not affected6. Beta-blockers that are nonselective may amplify hypoglycemia brought on by insulin and can hinder the restoration of normal serum glucose concentrations. Patients who have both heart failure and diabetes may experience a worsening of hyperglycemia7. It may become necessary to check glucose more often or to modify the dose of the antidiabetic drug12. When these agents are used together, watch carefully for hypoglycemia-related signs and symptoms, and should the beta-blocker be discontinued, monitor for a loss of glycemic control3.
Why it happens (mechanism)
Altered glucose metabolism and beta blockade
How to manage this interaction
This is a manageable combination. Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise.
- Your team may ask you to check your blood sugar more often to catch any swings early.
- Your antidiabetic dose may be adjusted and individualized by your care team as needed.
- Learn the other signs of low blood sugar (sweating, shakiness, confusion), since carteolol can hide the racing-heart warning.
- If your carteolol is ever stopped or changed, tell your team so they can watch for your sugar running high.
Raise any concerns with your pharmacist or prescriber.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
2 reports — tap to read
a) In elderly diabetic patients receiving either insulin or sulfonylureas, the selection of antihypertensive agent had little impact on hypoglycemia risk, but once other risk factors were accounted for, the lowest risk occurred with cardioselective beta blockers and the highest with non-cardioselective beta blockers, while other antihypertensive agents produced intermediate outcomes (N=13,559) 4.
b) In patients with hypertension and non-insulin dependent diabetes, beta blockers worsened long-term glycemic control, whereas alpha blockade and ACE inhibitors did not. Beta blockade was also accompanied by some unfavorable effects on the lipid profile. These effects were particularly notable with propranolol. Using an alpha blocker together with the beta blocker prevented the deterioration caused by beta blockade 5.
Common questions
Can I take Acarbose and Carteolol together?
Taking acarbose with carteolol can cause blood sugar swings and can hide the fast-heartbeat warning of low blood sugar, so monitor your glucose more closely and know the other low-sugar signs. Your care team can manage this with monitoring and dose adjustments. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Acarbose and Carteolol interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How is the Acarbose and Carteolol interaction managed?
This is a manageable combination. Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise. Your team may ask you to check your blood sugar more often to catch any swings early. Your antidiabetic dose may be adjusted and individualized by your care team as needed. Learn the other signs of low blood sugar (sweating, shakiness, confusion), since carteolol can hid… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
Questions for your pharmacist
- Does my dose of Acarbose or Carteolol 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 anything you'd monitor while I'm on both?
References (7)
- Product Information: TOUJEO(R) subcutaneous injection, insulin glargine subcutaneous injection. sanofi-aventis (per manufacturer), Bridgewater, NJ, 2015. DailyMed
- Product Information: AMARYL(R) oral tablets, glimepiride oral tablets. Sanofi-Aventis U.S. LLC (per FDA), Bridgewater, NJ, 2013. DailyMed
- Product Information: Glynase(R) PresTab(R) oral micronized tablets, glyburide oral micronized tablets. Pharmacia & Upjohn Co (per FDA), New York, NY, 2013. DailyMed
- Shorr RI, Ray WA, Daugherty JR, et al: Antihypertensives and the risk of serious hypoglycemia in older persons using insulin or sulfonylureas. JAMA 1997; 278:40-43. DOI
- Whitcroft IA, Thomas JM, Rawsthorne A, et al: Effects of alpha and beta adrenoceptor blocking drugs and ACE inhibitors on long term glucose and lipid control in hypertensive non-insulin dependent diabetics. Horm Metab Res Suppl 1990; 22:42-46.
- Product Information: TENORMIN(R) oral tablets, atenolol oral tablets. AstraZeneca Pharmaceuticals LP (per FDA), Wilmington, DE, 2012. DailyMed
- Product Information: COREG CR(R) extended-release oral capsules, carvedilol phosphate extended-release oral capsules. GlaxoSmithKline, Research Triangle Park, NC, 2011. DailyMed
Keep reading about Acarbose
Keep reading about Carteolol
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