Metoprolol 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
Metoprolol
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.
You're taking metoprolol (a beta-blocker for the heart or blood pressure) along with acarbose (a diabetes medicine that lowers blood sugar). These two can affect each other in a couple of ways. Your blood sugar may swing a little higher or lower than expected, so it may need closer watching.
The bigger thing to know: beta-blockers can hide some warning signs of low blood sugar. Normally a fast or pounding heartbeat tips you off, and metoprolol can quiet that signal. The good news is you'll usually still feel sweating and shakiness. Your care team can manage this easily by checking your sugars a bit more often and adjusting doses if needed.
Effect: Beta-blockade with concurrent antidiabetic therapy may alter glycemic control (hypo- or hyperglycemia) and blunt adrenergic warning signs of hypoglycemia.
- Mechanism: Altered glucose metabolism plus beta-adrenergic blockade; metoprolol is beta-1 selective, so masking of hypoglycemia (tachycardia) is less pronounced than with nonselective agents, though still possible. Sweating and dizziness generally persist.
- Direction/magnitude: Variable; may potentiate or impair recovery from hypoglycemia, or worsen hyperglycemia (notably in HF).
- Onset: Delayed. Evidence: Probable.
- Management: Increase SMBG frequency; 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
When antidiabetic medications are used together with beta-blockers, the result may be either hypoglycemia or hyperglycemia, and the combination can also mask signs of low blood sugar12. Among hypoglycemic symptoms, tachycardia may be influenced, whereas others such as dizziness and sweating are not 6. Insulin-induced hypoglycemia can be intensified by nonselective beta-blockers, which may also impede the return of serum glucose to normal levels. In individuals who have both heart failure and diabetes, hyperglycemia may become worse 7. It may be necessary to monitor glucose more often or to adjust the dose of the antidiabetic drug 12. During combined therapy, watch carefully for indications of hypoglycemia, and should the beta-blocker be discontinued, monitor for a loss of glycemic control 3.
Why it happens (mechanism)
Altered glucose metabolism and beta blockade
How to manage this interaction
This combination is commonly used and is manageable. Keep taking both exactly as prescribed unless your prescriber tells you otherwise.
- Check your blood sugar more often, especially when starting, changing, or stopping either drug, so your team can spot swings early.
- Know your low-sugar signs beyond a racing heart, since metoprolol can dull that cue. Watch for sweating, shakiness, hunger, or confusion.
- Your diabetes dose may be adjusted and individualized by your care team based on your readings.
- Tell your pharmacist or doctor if you notice more frequent highs or lows, or if either medicine is stopped.
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 minimal impact on hypoglycemia risk, but once other risk factors were accounted for, the lowest risk was seen with cardioselective beta blockers and the highest with non-cardioselective beta blockers, while other antihypertensive drugs produced intermediate outcomes (N=13,559) 4.
b) In patients with hypertension and non-insulin dependent diabetes, beta blockers, though not alpha blockade and ACE inhibitors, produced a worsening of long-term glycemic control. Certain unfavorable effects on the lipid profile were also seen with beta blockade. These effects were particularly pronounced with propranolol. Using an alpha blocker together with the beta blocker prevented the worsening attributable to beta blockade 5.
Common questions
Can I take Metoprolol and Acarbose together?
Metoprolol can make your blood sugar less predictable and may hide a racing heartbeat that warns of a low, so check your sugars more often and know the other warning signs. Your care team can adjust your diabetes dose and monitoring as needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Metoprolol and Acarbose 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 Metoprolol and Acarbose interaction managed?
This combination is commonly used and is manageable. Keep taking both exactly as prescribed unless your prescriber tells you otherwise. Check your blood sugar more often, especially when starting, changing, or stopping either drug, so your team can spot swings early. Know your low-sugar signs beyond a racing heart, since metoprolol can dull that cue. Watch for sweating, shakiness, hunger, or confu… 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Metoprolol 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 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 Metoprolol
Keep reading about Acarbose
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