Glyburide and Atenolol: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 15, 2026 · Source data updated Jul 11, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Atenolol
Glyburide
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 atenolol (a beta-blocker for blood pressure or heart) along with glyburide (a diabetes pill that lowers blood sugar). These two can interact in two ways. First, they can change your blood sugar, pushing it either too low or sometimes too high. Second, and more importantly, atenolol can mask some of the usual warning signs of low blood sugar, like a racing heartbeat. The good news is you'll likely still notice sweating and dizziness.
The best move is simply to keep checking your blood sugar as directed and know your own warning signs. Your care team can manage this easily by watching your numbers and adjusting your medications if needed.
Effect: Beta-blockade may alter glycemic control (hypo- or hyperglycemia) and blunt adrenergic warning signs of hypoglycemia.
- Mechanism: Beta-blockade attenuates catecholamine-mediated counterregulation; atenolol is beta-1 selective, so masking of hypoglycemia (notably tachycardia) is less pronounced than with nonselective agents, but not absent. Sweating and dizziness are usually preserved.
- Direction/magnitude: Variable; glyburide's glucose-lowering effect may increase or decrease. Recovery from hypoglycemia may be delayed.
- Onset: Delayed. Evidence: Probable. Severity: Moderate.
- Management: Increase SMBG frequency; individualize glyburide dosing. On beta-blocker withdrawal, monitor for loss of glycemic control.
What happens
Hypoglycemia or hyperglycemia; decreased symptoms of hypoglycemia
Interaction Deep Dive
When antidiabetic medications are taken together with beta-blockers, the result can be either hypoglycemia or hyperglycemia, and the combination may mask the warning signs of hypoglycemia23. Among those signs, tachycardia may be altered, whereas other hypoglycemic manifestations such as dizziness and sweating may not be1. Insulin-induced hypoglycemia can be intensified by nonselective beta-blockers, which can also hinder the return of serum glucose to normal levels. In patients who have both heart failure and diabetes, hyperglycemia may become more severe7. It may be necessary to check glucose more often or to modify the dose of the antidiabetic drug23. During combined use, watch carefully for the signs and symptoms of hypoglycemia, and should the beta-blocker be discontinued, monitor for a loss of glycemic control4.
Why it happens (mechanism)
Altered glucose metabolism and beta blockade
How to manage this interaction
This is a manageable combination, and both medications are often used together safely.
- Keep taking both as prescribed unless your prescriber tells you otherwise.
- Check your blood sugar more often, especially when you first start, since your care team may want closer monitoring for a while.
- Know your low-sugar signs: your heartbeat may not speed up as noticeably, so pay attention to sweating, shakiness, or dizziness.
- Your glyburide dose may be adjusted and individualized by your care team based on your readings.
- If your atenolol is ever stopped, tell your team so they can watch for changes in your blood sugar control.
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 the risk of hypoglycemia; however, 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 agents produced intermediate outcomes (N=13,559) 5.
b) In patients with hypertension and non-insulin dependent diabetes, beta blockers produced a worsening of long-term glycemic control, whereas alpha blockade and ACE inhibitors did not. Beta blockade also led to some unfavorable changes in the lipid profile. These effects were particularly evident with propranolol. Using an alpha blocker together with the beta blocker prevented the worsening caused by beta blockade 6.
Common questions
Can I take Glyburide and Atenolol together?
Atenolol can mask some warning signs of low blood sugar (like a fast heartbeat) and may shift your glucose control while on glyburide, so monitor your blood sugar more closely and know your other low-sugar symptoms. Your care team can manage this by adjusting doses and watching your numbers. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Glyburide and Atenolol 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 Glyburide and Atenolol interaction managed?
This is a manageable combination, and both medications are often used together safely. Keep taking both as prescribed unless your prescriber tells you otherwise. Check your blood sugar more often, especially when you first start, since your care team may want closer monitoring for a while. Know your low-sugar signs: your heartbeat may not speed up as noticeably, so pay attention to sweating, shaki… 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 Glyburide or Atenolol 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: TENORMIN(R) oral tablets, atenolol oral tablets. AstraZeneca Pharmaceuticals LP (per FDA), Wilmington, DE, 2012. DailyMed
- 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: COREG CR(R) extended-release oral capsules, carvedilol phosphate extended-release oral capsules. GlaxoSmithKline, Research Triangle Park, NC, 2011. DailyMed
Keep reading about Atenolol
Keep reading about Glyburide
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