Melatonin 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
Melatonin
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.
Here's what's going on. Beta-blockers like atenolol (Tenormin) can lower how much melatonin your own body makes at night. Melatonin is the hormone that helps you feel sleepy, so less of it can mean trouble falling or staying asleep. If you take a melatonin supplement, this may be part of why your doctor suggested it.
Please don't stop or change anything on your own. The good news is this is easy to manage. Your care team may have you take your atenolol in the morning so it interferes less with your natural nighttime melatonin. Talk with your pharmacist or doctor about the best timing for you.
Effect: Beta-blockers, including atenolol, can suppress nocturnal endogenous melatonin secretion (a beta-1 adrenergic mediated pathway governs pineal melatonin release), potentially contributing to sleep disturbance.
- Direction: Reduced endogenous melatonin; supplemental melatonin is sometimes used to offset this.
- Evidence: Theoretical / mechanistic; magnitude and onset not well characterized.
- Severity on file: Major.
- Neither agent is a prodrug; interaction is pharmacodynamic, not CYP-mediated.
Management: Consider morning administration of atenolol to minimize nighttime melatonin suppression. Assess sleep quality; supplemental melatonin may be considered at the prescriber's discretion.
What happens
An increased risk of suppression of endogenous melatonin levels
Interaction Deep Dive
Taking melatonin together with beta-blockers can inhibit the endogenous release of melatonin at night; consequently, beta-blockers should be given in the morning1.
Why it happens (mechanism)
Suppression of endogenous melatonin levels
How to manage this interaction
The reassuring part: this is manageable with simple timing changes and monitoring.
- Keep taking both atenolol and melatonin exactly as prescribed unless your care team tells you otherwise.
- Your team may suggest taking your atenolol in the morning so it interferes less with your body's natural nighttime melatonin.
- Tell your pharmacist or doctor if you notice trouble sleeping, since this can be adjusted and individualized for you.
Bring up your current dosing times at your next visit so your team can fine-tune the plan.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Melatonin and Atenolol together?
Atenolol can lower your body's natural nighttime melatonin, which may affect sleep; taking atenolol in the morning often helps, so ask your pharmacist or doctor about the best timing. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Melatonin and Atenolol 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 Melatonin and Atenolol interaction managed?
The reassuring part: this is manageable with simple timing changes and monitoring. Keep taking both atenolol and melatonin exactly as prescribed unless your care team tells you otherwise. Your team may suggest taking your atenolol in the morning so it interferes less with your body's natural nighttime melatonin. Tell your pharmacist or doctor if you notice trouble sleeping, since this can 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Melatonin 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 a safer alternative to one of these medications for me?
References (1)
- Product Information: Slenyto oral prolonged-release tablets, melatonin oral prolonged-release tablets. RAD Neurim Pharmaceuticals EEC SARL (per EMA), Paris, France, 2025. DailyMed
Keep reading about Atenolol
Keep reading about Melatonin
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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