Famotidine and Levoketoconazole: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Famotidine
Levoketoconazole
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.
What happens
An increased risk of QT interval prolongation, torsades de pointes and reduced levoketoconazole exposure
Interaction Deep Dive
Coadministration of levoketoconazole with other drugs that can cause QT prolongation, including famotidine, is contraindicated as it may increase risk of QT interval prolongation associated with ventricular arrhythmias and may increase risk of torsades de pointes. If levoketoconazole and H2 receptor antagonists such as famotidine is coadministered, it may also impair levoketoconazole absorption1.
Why it happens (mechanism)
Additive QT interval prolongation; impaired absorption of levoketoconazole
Common questions
Can I take Famotidine and Levoketoconazole together?
An increased risk of QT interval prolongation, torsades de pointes and reduced levoketoconazole exposure Always confirm with your pharmacist or prescriber before making any change.
How serious is the Famotidine and Levoketoconazole interaction?
It is rated contraindicated. These should generally not be used together.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
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 Famotidine or Levoketoconazole 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: RECORLEV(R) oral tablets, levoketoconazole oral tablets. Xeris Pharmaceuticals Inc (per FDA), Chicago, IL, 2023. DailyMed
Keep reading about Famotidine
Keep reading about Levoketoconazole
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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