Atenolol and Darunavir: 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
Darunavir
No brand names on recordAtenolol
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've been prescribed darunavir (usually taken with ritonavir for HIV) along with atenolol (Tenormin), a beta blocker for blood pressure or heart rate. The concern is that darunavir may raise the amount of atenolol in your body. If that happens, you could feel more of atenolol's effects, like a slower heart rate, low blood pressure, dizziness, or tiredness.
Please know this is based on a theoretical concern, not strong real-world data. The good news is your care team can manage this easily by watching your heart rate and blood pressure, and adjusting your atenolol dose if needed. Keep taking both as prescribed and check with your pharmacist or doctor.
Effect: Coadministration of darunavir/ritonavir with atenolol may increase beta blocker exposure, raising the risk of beta blocker-related adverse effects (bradycardia, hypotension, fatigue).
- Direction: Increased atenolol exposure (increased drug effect).
- Mechanism: Unknown; note atenolol is predominantly renally cleared and minimally metabolized, so the theoretical basis is uncertain.
- Evidence: Theoretical; magnitude and onset not established.
- Severity: Major (per source).
Management: Clinical monitoring of heart rate and blood pressure is recommended; consider a lower atenolol dose, individualized to response. Neither agent is a prodrug requiring reinterpretation of direction.
What happens
Increased beta blocker exposure and an increased risk of beta blocker-related adverse effects
Interaction Deep Dive
When beta blockers are given together with darunavir/ritonavir, the resulting exposure to the beta blockers may be raised. During such concurrent use, it is advised that patients be monitored clinically and that reducing the beta blocker dose be considered1.
Why it happens (mechanism)
Unknown
How to manage this interaction
Your care team can manage this combination safely. Typically they will:
- Monitor you more closely, checking heart rate and blood pressure for signs of too much beta blocker effect.
- Consider a lower atenolol dose if needed, tailored and individualized to how you respond.
What you should do:
- Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise.
- Tell your pharmacist or doctor if you notice dizziness, unusual tiredness, fainting, or a slow heartbeat.
- Ask your pharmacist before making any changes.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Atenolol and Darunavir together?
Darunavir may increase atenolol levels and beta blocker side effects like slow heart rate and low blood pressure, though this is a theoretical concern. Keep taking both as prescribed and let your care team monitor you and adjust the atenolol dose if needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Atenolol and Darunavir 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 Atenolol and Darunavir interaction managed?
Your care team can manage this combination safely. Typically they will: Monitor you more closely, checking heart rate and blood pressure for signs of too much beta blocker effect. Consider a lower atenolol dose if needed, tailored and individualized to how you respond. What you should do: Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise. Tell your pharm… 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.
Questions for your pharmacist
- Does my dose of Atenolol or Darunavir 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: PREZISTA(R) oral suspension, oral tablets, darunavir oral suspension, oral tablets. Janssen Products, LP (per FDA), Horsham, PA, 2023. DailyMed
Keep reading about Darunavir
Keep reading about Atenolol
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