Sitagliptin 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
Sitagliptin
Atenolol
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 Januvia (sitagliptin) to help lower your blood sugar, and atenolol (Tenormin) for your heart or blood pressure. When these two are used together, a couple of things can happen. Your blood sugar could run a little higher or lower than expected, so your numbers may need extra watching.
The other thing to know is that atenolol can quietly hide one of the early warning signs of low blood sugar, a fast or pounding heartbeat. The good news is that other warning signs, like sweating and dizziness, usually still show up. This is very manageable. Your care team can check your sugars more often and fine-tune your doses so you stay in a safe range.
Effect: Additive/variable glycemic effect and blunting of hypoglycemia awareness. Neither drug is a prodrug; this is a pharmacodynamic interaction, not CYP-mediated.
- Direction: Beta-blockade may potentiate or mask hypoglycemia; worsening hyperglycemia is also possible, particularly in diabetics with heart failure.
- Symptom masking: Adrenergic tachycardia is attenuated; diaphoresis and dizziness are typically preserved. Atenolol is beta-1 selective, so masking is less pronounced than with nonselective agents.
- Onset: Delayed. Evidence: Probable. Severity: Moderate.
- Management: Increase frequency of glucose monitoring; individualize antidiabetic dosing. If atenolol is withdrawn, watch 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, patients may experience either hypoglycemia or hyperglycemia, and the warning signs of hypoglycemia may be masked23. Tachycardia may be affected, although other hypoglycemic symptoms such as dizziness and sweating are not1. Insulin-induced hypoglycemia can be intensified by nonselective beta-blockers, which may also hinder the return of serum glucose to normal levels. Patients who have both heart failure and diabetes may see their hyperglycemia deteriorate7. It may be necessary to monitor glucose more often or to modify the dose of the antidiabetic agent23. During combined use, watch carefully for 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 combination is commonly used and is manageable. Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise.
- Your team may monitor your blood sugar more often, especially when either drug is started or changed.
- Your antidiabetic dose may need to be adjusted and individualized by your care team based on your readings.
- Learn the low-sugar signs that atenolol does not hide, such as sweating, dizziness, shakiness, or confusion, and treat and report lows.
- If atenolol is ever stopped, tell your prescriber so they can watch for your sugar rising.
Bring your glucose logs to appointments and raise any highs or lows with your pharmacist or doctor.
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 particular antihypertensive drug selected had minimal impact on the risk of hypoglycemia; however, after accounting for other risk factors, the risk was lowest with cardioselective beta blockers and highest with non-cardioselective beta blockers, while other antihypertensive agents fell in between (N=13,559) 5.
b) In patients with hypertension and non-insulin dependent diabetes, beta blockers, but neither alpha blockade nor ACE inhibitors, produced a worsening of long-term glycemic control. Beta blockade was also associated with 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 attributable to beta blockade 6.
Common questions
Can I take Sitagliptin and Atenolol together?
Sitagliptin and atenolol can be used together, but your blood sugar may need closer monitoring and possibly dose tuning, and atenolol can hide a fast heartbeat that normally signals a low. Watch for sweating and dizziness and report unusual readings to your care team. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Sitagliptin 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 Sitagliptin and Atenolol interaction managed?
This combination is commonly used and is manageable. Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise. Your team may monitor your blood sugar more often, especially when either drug is started or changed. Your antidiabetic dose may need to be adjusted and individualized by your care team based on your readings. Learn the low-sugar signs that atenolol do… 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 Sitagliptin 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 Sitagliptin
Keep reading about Atenolol
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